He is known for his contributions to the establishment of temps atomique international (TAI) and the geodetic reference system used in satellite navigation.
From 1984 to 1992 he was a physicien principal (senior physicist), and then a consultant, at the Bureau international des poids et mesures (BIPM).
[12] He and his colleagues worked on a number of space experiments, such as determining the position of the Earth's pole using Doppler tracking of artificial satellites.
[13] He collaborated in research on determining the radial velocities of Mercury,[14] studying movements in the atmosphere of Venus by spectroscopic methods,[15] and measuring the time of a round trip from the Earth to the Moon and back of a reflected light pulse.
[18] He was appointed Chevalier de l’Ordre national du mérite, as well as Officier des palmes académiques.