Observations of the first light and the epoch of reionization by Xiao-Hui Fan

Xiaohui Fan

Prof. Xiaohui Fan

Dr. Xiaohui Fan is a Professor of Astronomy at Steward Observatory, the University of Arizona, USA, and a Visiting Chair Professor at the Kavli Institute for Astronomy and Astrophysics, Peking University, China.

Dr. Fan received his B.S. degree in Astronomy from Nanjing University, China, in 1992, his M. S. degree from the Chinese Academy of Science in 1995, and his Ph. D. in Astrophysics from Princeton University, USA, in 2000. He was a Member of the School of Natural Science in the Institute for Advanced Study in Princeton from 2000 to 2002, and jointed the faculty at Arizona in 2002.

Dr. Fan is an observational astronomer. His main research interests include galaxy formation and evolution, surveys of high-redshift galaxies and quasars, evolution of supermassive black holes, the intergalactic medium, and the epoch of reionization. He also has a long association with the Sloan Digital Sky Survey project, and led the high-redshift quasar survey within the SDSS.

Emergent perspective of gravity and dark energy by T. Padmanabhan

T. Padmanabhan

Prof. Thanu Padmanabhan

Professor Thanu Padmanabhan is an internationally acclaimed Theoretical Physicist whose research spans a wide variety of topics in Gravitation, Structure formation in the universe and Quantum Gravity.

Born in 1957, Padmanabhan took his Bachelor and Masters degrees in Physics from Kerala University. Subsequently he joined TIFR, Mumbai where he did his Ph.D and held various faculty positions during 1980-1992. He moved to the Inter-University Centre for Astronomy and Astrophysics (IUCAA), Pune in 1992 and took over as the Dean of that Centre in 1997. He has been a visiting faculty at several institutions abroad including Caltech, Princeton University and Institute of Astronomy, Cambridge.

Padmanabhan's early work was in quantum cosmology, structure formation in the universe and statistical mechanics of gravitating systems. In the eighties he showed that: (i) Initial singularity in cosmology can be eliminated by quantum gravitational effects, and (ii) Planck length can be interpreted as the zero point length of the spacetime, in a model independent manner. This result, established by theoretical considerations and well-chosen thought experiments, find an echo in more recent results in several other candidate models for quantum gravity.

Around this time he also turned his attention to the problem of statistical mechanics of gravitating systems. He was a pioneer in the systematic application of these concepts to study the gravitational clustering in an expanding universe and his contributions were well-recognized both in cosmology as well as condensed matter community. This study naturally led him, in the nineties, to work on several aspects of cosmological structure formation, both analytically and by numerical simulations. His efforts in this field led to the development of a significant amount of activity in this area in India, which is now internationally recognized. Padmanabhan played a key role in initiating contemporary research in standard cosmology in India to a large measure. In recent years, he has contributed significantly to the statistical analysis of data related to dark energy and to its theoretical modeling. Padmanabhan's work in the last decade, interpreting gravity as an emergent phenomenon, has far-reaching implications for quantum gravity and nature of dark energy and has made a deep impact on the subject. He has demonstrated that the field equations of gravity in a wide class of theories can be described in a purely thermodynamic language, like in fluid dynamics. Padmanabhan could also show that several peculiar aspects of classical gravitational theories find natural interpretations in this approach,

He has written more than 200 papers in international journals and authored nine books which have been acclaimed as a classics in the field. Padmanabhan has received numerous awards and distinctions in India and abroad. He was a Sackler Distinguished Astronomer of the Institute of Astronomy, Cambridge, and is currently the President of the Cosmology Commission of the International Astronomical Union and the Chairman of Astrophysics commission of IUPAP.

He was awarded the medal of honour for distinguished service, Padma Shri, by the President of India in 2007 which is the fourth highest civilian honour in India.

The current status of galaxy formation by Joseph Silk and Gary A. Mamon

J. Silk

Prof. Joseph Silk

Joseph Silk is a professor at the Institut d'Astrophysique de Paris (IAP) and Université Pierre & Marie Curie, in Paris. He is also the Homewood Professor of Physics and Astronomy at The Johns Hopkins University, Baltimore. He is emeritus Savilian Professor of Astronomy at the University of Oxford, where he is a Senior Fellow at the Beecroft Institute for Particle Astrophysics and Cosmology. Most of his scientific research is related to cosmology and particle astrophysics, and his specialties include the cosmic microwave background, galaxy formation and dark matter. He has published more than 700 refereed articles and several popular books.

Gary Mamon

Prof. Gary Mamon

Gary Mamon is an Astronomer at the Institut d'Astrophysique de Paris (IAP) and teaches at the Université Pierre & Marie Curie in Paris. He research focusses mainly on mass/orbit modeling using internal motions, galaxy formation and galaxy environments and their effects on galaxies.

Astrophysical applications of gravitational microlensing by Shu-De Mao

Shude Mao

Professor Shude Mao

Dr. Shude Mao is a professor of astrophysics at the National Astronomical Observatories of China and University of Manchester, UK. He obtained his PhD from Princeton University in 1992. He was a postdoctoral fellow at the Harvard-Smithsonian Center for Astrophysics and the Max-Planck Institute for Astrophysics. He joined the University of Manchester as a faculty member at the end of 1999. He won the Friedrich Wilhelm Bessel Research Award from the Humbolt Foundation in 2007.

His current research interests are gravitational lensing, galactic dynamics and galaxy formation. He proposed gravitational microlensing as a way to detect extrasolar planets in the Milky Way and showed that strong gravitational lenses can be used to probe substructures and supermassive black holes in galaxies. He co-developed a model for the formation and evolution of disk galaxies.

web site: www.jb.man.ac.uk/~smao

X-ray spectroscopy of clusters of galaxies by Naomi Ota

Naomi Ota

Professor Naomi Ota

Assistant professor, Department of Physics, Nara Women's University

Contact information:

Address: Department of Physics, Nara Women's University,
Kitauoyanishimachi, Nara, Nara 630-8506, Japan
E-mail: naomi@cc.nara-wu.ac.jp
Phone: +81-(0)742-20-3386, FAX: +81-(0)742-20-3386
Homepage: http://www.phys.nara-wu.ac.jp/~ota/


The University of Tokyo, Ph.D., Physics, 2001
The University of Tokyo, Master of Science, Physics, 1998
The University of Tokyo, Bachelor of Science, Physics, 1996

Professional history:

Assistant professor, Department of Physics, Nara Women's University, Dec. 2010--Present
Assistant professor, Department of Physics, Tokyo University of Science, Apr. 2009--Nov. 2010
Humboldt Fellow, Max Planck Institute for extraterrestrial Physics, Jul. 2007--Mar. 2009
Aerospace Project Research Associate, Japan Aerospace Exploration Agency, Apr. 2007--Mar. 2009
Special Postdoctoral Researcher, RIKEN (The Institute of Physical and Chemical Research), Apr. 2004 -- Mar. 2007
Postdoctoral Research Fellow, Japan Society for the Promotion of Science, Apr. 2001--Mar. 2004
Research Fellow, Japan Society for the Promotion of Science, Apr. 1998--Mar. 2001

Brief Introduction:

Research area: Study of structure and evolution of galaxy clusters using X-ray and multi-wavelength observations. Calibration of X-ray micro-calorimeter onboard the ASTRO-H satellite.

Publication list:


Galactic center research: manifestations of the central black hole by Mark R. Morris, Leo Meyer and Andrea M. Ghez

Mark R. Morris

Prof. Mark R. Morris

Homepage: http://www.astro.ucla.edu/~morris/

Mark Morris is a Professor of Astronomy in the Department of Physics and Astronomy at the University of California, Los Angeles, where he has been since 1983. He has enjoyed research on the center of the Galaxy since being a graduate student in physics at the University of Chicago, but his PhD thesis topic there was on mass loss from evolved stars, a subject on which he continues to work. His other current areas of research include star formation and protostellar disks. Dr. Morris's work is primarily observational, and is carried out at all wavelengths, but has often involved theoretical explorations.

Leo Meyer

Dr. Leo Meyer


Assistant Researcher, Department of Physics and Astronomy, University of California Los Angeles

Contact Information:

Phone: 310-206-5617;
Email: leo@astro.ucla.edu


Ph.D., Physics, University of Cologne, Germany 2008
Diploma (M.Sc. equivalent), Physics, University of Aachen, Germany 2005

Research Expertise:

Galactic Center, Black Holes, General Relativity, High Resolution Imaging and Polarimetry with Adaptive Optics

Recent Professional Positions:

Assistant Researcher, University of California Los Angeles 2011 - present
Software Developer/Quantitative Analyst, German Investment Bank 2009 - 2010
Postdoctoral Researcher, University of California Los Angeles 2008 - 2009

Awards & Honors:

DAAD Postdoctoral Fellowship 2008 - 2009
Graduate Fellowship of the Max-Planck Society 2005 - 2008

Five Recent Relevant Publications:

  • Meyer, L.; Do, T.; Ghez, A.; Morris, M.; Yelda, S.; Eckart, A.; Schödel, R., 2009 "A power-law break in the near-infrared power spectrum of the Galactic center black hole," Astrophysical Journal Letters, Volume 694, Issue 1, pp. 87 - 91.
  • Meyer, L.; Do, T.; Ghez, A.; Morris, M.; Witzel, G.; Eckart, A.; Belanger, G.; Schödel, R., 2008 "A 600 Minute near-infrared lightcurve of Sagittarius A*," Astrophysical Journal Letters, Volume 688, pp.17-20.
  • Meyer, L.; Schödel, R.; Eckart, A.; Duschl, W. J.; Karas, V.; Dovčiak, M., 2007 "On the orientation of the Sagittarius A* system," Astronomy and Astrophysics, Volume 473, Issue 3, pp.707-710.
  • Meyer, L.; Eckart, A.; Schödel, R.; Duschl, W. J.; Mužić, K.; Dovčiak, M.; Karas, V., 2006 "Near-infrared polarimetry setting constraints on the orbiting spot model for Sgr A* flares," Astronomy and Astrophysics, Volume 460, Issue 1, pp.15-21.
  • Meyer, L.; Schödel, R.; Eckart, A.; Karas, V.; Dovčiak, M.; Duschl, W. J., 2006 "K-band polarimetry of an Sgr A* flare with a clear sub-flare structure," Astronomy and Astrophysics, Volume 458, Issue 2, pp.L25-L28.

Andrea M. Ghez

Prof. Andrea M. Ghez

Andrea M. Ghez, distinguished professor of Physics & Astronomy and head of UCLA's Galactic Center Group, is a world-leading expert in observational astrophysics. She earned her B.S. in Physics from MIT in 1987 and her Ph.D. from Caltech in 1992, and has been on the faculty at UCLA since 1994. She has used the Keck telescopes to demonstrate the existence of a supermassive black hole at the center of our galaxy, with a mass 4 million times that of our sun. This is the best evidence yet that these exotic objects really do exist, and provides us with a wonderful opportunity to study the fundamental laws of physics in the extreme environment near a black hole, and learn what role this black hole has played in the formation and evolution of our galaxy.

Professor Ghez has actively disseminated her work to a wide variety of audiences through more than 100 refereed papers and 200 invited talks, as well features in textbooks, documentaries, and science exhibits. She has received numerous honors and awards including the Crafoord Prize, a MacArthur Fellowship, election to the National Academy of Sciences and the American Academy of Arts & Sciences, the Aaronson Award from the University of Arizona, the Sackler Prize from Tel Aviv University, the American Physical Society's Maria Goeppert-Mayer Award, the American Astronomical Society's Newton Lacy Pierce Prize, a Sloan Fellowship, a Packard Fellowship, and several teaching awards. Her most recent service work includes membership on the National Research Council's Board on Physics & Astronomy, the Thirty-Meter-Telescope's Science Advisory Committee, the Keck Observatory Science Steering Committee, and the Research Strategies Working Group of the UC Commission on the Future.

The assembly of the Milky Way and its satellite galaxies by Martin C. Smith, Sakurako Okamoto, Hai-Bo Yuan and Xiao-Wei Liu

Martin Smith

Prof. Martin Smith

Martin Smith is a research professor at the Kavli Institute for Astronomy and Astrophysics (KIAA) in Beijing, where he has been employed since September 2009. His main research deals with the analysis and interpretation of data from large spectroscopic surveys like SDSS/SEGUE and LAMOST. In particular he is interested in utilising such data sets to understand both the structure of the Milky Way and its formation. Prior to this he was a postdoc at the Institute of Astronomy in Cambridge (2007-2009) and at the Kapteyn Institute in the Netherlands (2004-2007). Whilst at the Kapteyn Institute he worked mainly on the analysis of data from the RAVE survey, most notably producing a paper constraining the local escape speed of the Milky Way. He obtained his Ph.D from the University of Manchester (2000-2003) on the subject of gravitational microlensing.

Sakurako Okamoto is a Kavli Postdoctoral Fellow at KIAA. She gained her PhD from the University of Tokyo and then worked as postdoc at the University of Cambridge before moving to Beijing. She has extensive experience in the field of dwarf galaxies and has led a number of observational programs on the Subaru telescope.

Haibo Yuan is a LAMOST Postdoctoral Fellow at KIAA, having previously completed his PhD at Peking University. His research interests lie in wide-field surveys and his main efforts centre on the DSS-GAC survey.

Xiaowei Liu is a Professor at the Department of Astronomy in Peking University and acting director of KIAA. Having obtained his PhD from the Beijing Astronomical Observatory he was a postdoctoral researcher in University College London for a number of years before returning to Beijing.

Multi-planet extrasolar systems - detection and dynamics by Cristian Beaugé, Sylvio Ferraz-Mello and Tatiana A. Michtchenko

Cristian Beaugé

Prof. Cristian Beaugé

Professor of Astronomical Observatory, University of Cordoba, Argentina

Born March 17, 1963 in Córdoba, Argentina. Graduated from the Universidad Nacional de Córdoba (UNC), and obtained his PhD in the Universidade de São Paulo (USP, Brasil). Is currently an associate professor at UNC and an independent researcher from the Argentinian Research Council - Conicet-.

Sylvio Ferraz-Mello

Prof. Sylvio Ferraz-Mello

Physicist. Emeritus professor of the Institute of Astronomy, Geophysics and Atmospheric Sciences, University of Sao Paulo (Brasil). Docteur-ès-Sciences Mathématiques from Académie de Paris. Docteur Honoris Causa from Observatoire de Paris. Held visiting fellowships and lecturing positions at Paris and Nice (France), Austin (USA), La Plata (Argentina), Porto (Portugal), Viena (Austria) and Cambridge (U.K.). Member of the Brazilian Academy of Sciences and the Academy of Sciences for the Developing World. In recognition for many years of investigation on the dynamics of resonant asteroids, the asteroid 5201 has been named "Ferraz-Mello", by IAU. Authored two scientific books: "Canonical Perturbations Theory: Degenerate Systems and resonance" (Springer, New York) and "Dynamics of the Galilean Satellites: an introductory treatise" (MIR, Moscow). Currently is co- investigator of the space mission CoRoT, contributing to the dynamical characterization of the new discovered exoplanets and working on a new rheophysical theory of bodily tides to be applied to planetary satellites and exoplanets. Is editor-in-chief of the journal "Celestial Mechanics and Dynamical Astronomy".

Tatiana A. Michtchenko

Prof. Tatiana A. Michtchenko

Theoretician in the area of Celestial Mechanics. Currently Associate Professor of the Institute of Astronomy, Geophysics and Atmospheric Sciences of the University of Sao Paulo (Brazil). Master of Science in Physics and Mathematics from the Sternberg Institute of Astronomy of the Moscow Lomonosov University. PhD from the University of Sao Paulo. Held Post-doctoral fellowship at the Department of Planetary Sciences, University of Arizona. Research fields: extra-Solar planetary systems; dynamics of the Solar System; mathematical and dynamical astronomy.

Forming different planetary systems by Ji-Lin Zhou, Ji-Wei Xie, Hui-Gen Liu, Hui Zhang and Yi-Sui Sun

Jilin Zhou

Prof. Jilin Zhou

Professor Ji-Lin Zhou, Department of astronomy, Nanjing university.
Research interests: Planet formation and dynamics.
Awarded: the China National Funds for Distinguished Young Scientists in 2009.
Email: zhoujl@nju.edu.cn
homepage: http://astronomy.nju.edu.cn/~zjl/

Dr. Ji-Wei Xie got his PhD from Nanjing University in 2011. Now he is Postdoc at University of Toronto and a faculty of Nanjing University. His research interests are mainly on planet formation theory, debris disk, planets in binary systems and transiting planets. Contact: jwxie@astro.utoronto.ca, 50 st. George Street, Toronto, M5S 3H4, Ca
Dr. Hui-Gen Liu got his PhD from Nanjing University in 2011. Now he is a faculty of School of Astronomy and Space Science of Nanjing University. His research interest focus on the dynamical evolution and formation of planetary systems, especially the influences of the circumstellar gas disk. Connection email: huigen@nju.edu.cn.
Dr. Hui Zhang got his PhD from Nanjing University in 2008. Now He is an associate professor of the school of Astronomy and Space Science in Nanjing University. His research interests cover the formation, evolution and detection of the exoplanet system, e.g. the interaction between the proto-stellar disk and the proto-planet, dynamics of multiple-exoplanet system, detection of the transiting exoplanets, etc. Connection email: huizhang@nju.edu.cn.

Yisui Sun

Prof. Yi-Sui Sun

Prof. Yi-Sui Sun graduated from department of astronomy, Nanjing university in 1958, and became a professor of Nanjing university in 1983. His major research area is celestial mechainics and nonlinear sciences, exoplanet dynamics and publish around 100 papers. He first discovered and proved together with Prof. Cheng Chongqing the exsitence of 2-dimensional invariant tori in 3-dimensional volume-preserving maps. Due to his pioneering works on the worked field, he was elected as an academician of the Chinese Academy of Sciences in 1997 . He was the chief scientist of the State "Pandeng" Program and the State Key Basic Research Program ("973"). In his scientific career, He have won some awards, including the National Natural Science Award (2nd class) in 2001, the Ho Leung Ho Lee Foundation for Scientific and Technological Progress Award in 2001.Connection email: sunys@nju.edu.cn.

Solar-stellar astrophysics and dark matter by Sylvaine Turck Chièze and Ilídio Lopes

Sylvaine Turck-Chièze

Prof. Sylvaine Turck-Chièze

Sylvaine Turck-Chièze has passed her PhD thesis in Commissariat at Atomic Energy (CEA) at Saclay (France) in Nuclear Physics, developing experiments on internal charge density of nuclei and then on properties of nucleons inside the nuclei. After 13 years in that field, she has moved to the Space Astrophysics Department of CEA where she has first computed stellar models of different metallicities for galactic evolution in parallel to specialised works on reaction rates, opacities to improve the predictions of the solar neutrino fluxes. At the end of the eighties, the neutrino puzzle was not solved, she has suggested to use helioseismology to better constrain the theoretical prediction of these fluxes and has taken with enthusiasm the CEA responsibility of the building of the space GOLF seismic instrument in 1989 to ensure and verify the performances before launch. GOLF is one of the twelve instruments of the SoHO satellite launched in 1995 and always in observation. Then she has analysed and interpreted the corresponding data up to now.

Due to her formation, she has participated to the creation of the joint Department between Astrophysics, Particle physics, Nuclear physics, and Associated Instrumentation (DAPNIA) in 1992 at CEA called now IRFU (Institut des Lois Fondamentales de l'Univers, Institute of the fundamental laws of the Universe), a great institute of more than 600 persons. She has worked on dark matter in the ninety and recently, another motivation to analyze deeply the SOHO results. She was one of the first to show the remarkable agreement between helioseismology and all the solar neutrinos after the release of the SNO Canadian detector in 2004.

Along her carrier, she had the responsibility of teams of 10-15 persons to develop dynamical studies of the Sun and stellar interiors and large simulations of the stellar interior, together with instruments like a new prototype for next generation of space mission. She has directed a dozen of theses, international teams for new space mission and for absorption experiments on laser facilities for checking stellar microphysics, she has also participated to different scientific councils in France in different domains. She is the author of more than 130 refereed papers.

Ilídio Lopes

Prof. Ilídio Lopes

Ilídio Lopes, University of Évora and Instituto Superior Tecnico (Portugal)

Ilídio received an M.S. degree in 'Astrophysique et Techniques Spatiales' from University of Paris (France) in 1990, and a Ph.D. In Astrophysics from the University of Paris (France) in 1994. His Ph.D. research project was focused towards the understanding of the Physics of the interior of Sun, Helioseismology and Solar neutrinos.

From 1995 until 1999, Ilídio worked as a research fellow in Helio- and Asteroseismology at the Institute of Astronomy, University of Cambridge (United Kingdom).

From 2000 until 2004, he worked in the Department of Physics of the University of Oxford where his research interests focused towards the evolution of the Sun and stars within halos of dark matter.

Since 2004, Ilídio has joined the Department of Physics of the University of Évora and the Department of Physics of Instituto Superior Técnico in Portugal, where he lecture Physics, Astrophysics and Cosmology and continue his research work in Theoretical Astrophysics. Ilídio is particularly interested in the theoretical understanding of the evolution of the Sun and stars. He has published in the following fields: solar physics, solar dynamo, helioseismology, asteroseismology, solar neutrinos and evolution of stars within dark matter halos.

Gamma-ray bursts and their links with supernovae and cosmology by Peter Mészáros and Neil Gehrels

Péter Mészáros

Prof. Péter Mészáros

Péter Mészáros is the Eberly Chair of Astronomy & Astrophysics and Professor of Physics at the Pennsylvania State University, where he is Director of the Center for Particle and Gravitational Astrophysics, and member of the directorate of the Institute for Gravity and the Cosmos. He served as head of the Department of Astronomy and Astrophysics in 1993-2003, and he is the theory lead of the Swift satellite consortium, affiliated member of the Fermi satellite consortium, and member of the IceCube experiment team.

Born in Hungary and raised in Belgium and Argentina, he received his M.S. in Physics from the National University of Buenos Aires, followed by a Ph.D. at the University of California, Berkeley, in 1972. He was a postdoctoral fellow at Princeton and Cambridge Universities before joining the permanent staff of the Max Planck Institute for Astrophysics in Garching, Germany. He has held long term visiting appointments at the NASA Goddard Space Flight Center; the Harvard-Smithsonian Center for Astrophysics; Cambridge University; the Institute for Advanced Study, Princeton; CalTech; and the Kavli Institute of Theoretical Physics, UCSB. He is a Fellow of the American Academy of Arts and Sciences, Member of the Hungarian Academy of Sciences, and Fellow of the American Physical Society; he has been a co-recipient (twice) of the Rossi Prize of the American Astronomical Society, and the First Prize of the Gravity Research Foundation, as well as a recipient of Guggenheim, Royal Society, Smithsonian and NAS/NRC fellowships.

His main research interests are high energy astrophysics, cosmology and particle astrophysics. He has made significant contributions in the theory of structure formation in the early Universe; the high energy properties of magnetized neutron stars; the physics of gamma-ray bursts; ultra-high energy neutrinos and cosmic rays, and gravitational astrophysics. He is known for the "Mészáros effect" in cosmology, and for his development (with M.J. Rees) of the fireball shock model of gamma-ray bursts and the theory of afterglows. Thomson- Reuters ranks his work on gamma-ray bursts as number one by citations and number of papers over the 1999- 2009 period. He has written over 310 refereed research articles and 140 invited or contributed conference papers, with over 21,000 total citations, as well as several major review articles, and two books, "High energy radiation from magnetized neutron stars" (U. Chicago Press, 1992) and "The high energy Universe" (Cambridge U. Press, 2010).

A list of publications, a citation-ranked list of publications and a detailed C.V. can be found by clicking the link.

Neil Gehrels

Prof. Neil Gehrels

Neil Gehrels is an experimental physicist working in gamma-ray astronomy who is active in instrument development and data analysis, and dabbles in theory. His interests include gamma-ray bursts and supernovae. He is Principal Investigator for the Swift gamma-ray burst MIDEX mission. Other responsibilities include Project Scientist for the Compton Observatory (1991-2000), Mission Scientist for INTEGRAL, a Deputy Project Scientist for Fermi and Project Scientist for JDEM. Committees, societies, etc. include past Chair of the AAS High Energy Astrophysics Division and the APS Division of Astrophysics, Fellow of the APS, and member of the American Academy of Arts and Sciences and National Academy of Sciences. His wife, Ellen Williams, is Chief Scientist at BP and is on leave as a Distinguished Professor of physics at the University of Maryland. He has two children, Tommy and Emily, born in 1987 and 1990. His other interests include music and moutaineering. He climbed the Nose Route on El Capitan in Yosemite in a 6 day solo ascent in 2006.

Micro-arcsecond Celestial Reference Frames: definition and realization - Impact of the recent IAU Resolutions by Nicole Capitaine

Nicole Capitaine

Prof. Nicole Capitaine

Nicole Capitaine is Astronomer at Paris Observatory. She is Member of the Bureau des longitudes and Corresponding member of the French Académie des sciences. She has teached fundamental astronomy at the Master degree level at Paris Observatory for many years. Her scientific work has been conducted within a broad international cooperation. This led to a better definition of reference systems and time scales for astronomy, and a better understanding of Earth's rotation. This also led to the adoption, through international resolutions by the International Astronomical Union (IAU) and the International Union of Geodesy and Geophysics (IUGG), of new concepts, parameters and models for astronomy and geodesy, which are essential for many applications to space dynamics and dynamics of the solar system.

She has contributed to the national and international organization of fundamental astronomy and space geodesy, to its teaching and development, with leadership responsibilities of laboratory and doctoral training. Her activity has included responsibilities within the scientific divisions of the IAU, the organization of international scientific conferences and the development of scientific cooperation involving a large number of PhD students and postdocs between her team and various foreign institutions. At the IAU, she was President (2000-2003) of Division 1 "Fundamental Astronomy" of the International Astronomical Union (IAU) and of the IAU Commission 19 "Earth Rotation", Chair (2003-2006) of the IAU Working Group "Nomenclature for Fundamental Astronomy" and member of various Working Groups, such as on "Precession and the ecliptic" and "Numerical Standards for Fundamental Astronomy". She was also President of the Federation of Astronomical and Geophysical Data Analysis Services (FAGS) of ICSU (2006-2008). Since 1988, she has been organizer (or co-organizer) of the series of international meetings entitled "Space and time reference systems >> that have been organized on a nearly annual basis in Paris and other European countries.