Didier Queloz is a Swiss astronomer at the Geneva Observatory who, as a postgraduate student
from 1991 to 1995, worked with Michel Mayor
and codiscovered the first extrasolar planet around a star similar to the
Sun (see 51 Pegasi). From 1998 to 1999, Queloz
was a distinguished visiting scientist at the Jet Propulsion Laboratory.
Michel Mayor and Didier Queloz were also at the heart of a consortium, led
by the Geneva Observatory with the help of ESO and other organizations,
which developed the HARPS spectrograph, installed on ESO's 3.6-meter telescope
at the La Silla Observatory in Chile in 2003.