A short C.V.
Senior research engineer for the french CNRS (National Center for Scientific Research), I am working since November 1983 at the Paris Observatory. Formerly, my work was related to the european astrometric satellite Hipparcos, successively on its Input Catalogue, then data processing, and finally contributing to its science exploitation. I am since 1997 mostly involved in the preparation --> data processing --> science exploitation of the Gaia satellite (launched on 19-12-2013, end of scientific operations on 15-01-2025).
So, in brief, my main field is astronomy ;-)
Beside the technical work (IT-related: e.g. software development e.g., in the past, on databases or the first ObsPM Web server) or, from times tot times, teaching (statistics, computer languages), I defended my Ph.D. in 1993 and the full list of my scientific papers and technical notes can be found on my web page (or here on the NASA ADS for the articles only). These papers deal mostly with:
- the interstellar extinction (development of a tridimensional extinction model in the solar neighborhood),
- building the Hipparcos Catalogue (contribution to the Input Catalogue; merging of the astrometric intermediate data; contribution to the double star annex of the Hipparcos Catalogue),
- the use of the Hipparcos data (proof -in a broad sense- of the precision and accuracy of the parallaxes; demonstrating and avoiding the statistical biases on the data derived from them),
- the determination of distances, velocities, duplicity for open clusters and pre-main sequence stars
- the binary stars (determination of masses and luminosities of SB2s; first astrometric confirmation for a LTT binary ; confirmation of the brown dwarf desert with Hipparcos; orbital determinations used for the statistics of binarity) for solar type stars
- the exoplanets (the oldest proof of the transit of HD 209458; and also that Hipparcos cannot determine their orbital inclination),
- the preparation of the Gaia mission (on-board scientific data handling and double and multiples stars), then the scientific data validation (CU9) and I am now in charge of the handling of non-single stars (CU4/NSS).
If needed, you can contact me here 
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