when did he start his cosmonaut career?
December 1987
Yuri Gidzenko
From December 1987 to June 1989, Gidzenko attended basic space training as a test cosmonaut candidate.
when did humans first occupy the international space station 2 November 2000 what is expedition 1? Expedition 1 was the first long-duration stay on the International Space Station (ISS). how many members this long duration stay consist of? three can you mention their names? Bill Shepherd, Sergei Krikalev and  Yuri Gidzenko. who is the third one? He is a Russian cosmonaut. which university/college did he complete his education? Gidzenko graduated from the (MIIGAiK) in 1994 specializing in geodesy and cartography.
wiki:13068480
Yuri Gidzenko [SEP] Cosmonaut career
From December 1987 to June 1989, Gidzenko attended basic space training as a test cosmonaut candidate. Since September 1989 he attended advanced training as a test cosmonaut candidate. From March to October 1994 he trained for a space flight as a back-up crew commander (17th Primary Expedition/Euro-Mir-94 Program). From November 1994 to August 1995 he attended training for a space flight aboard the Soyuz TM transport vehicle/Mir orbital complex as the Expedition 20 Primary Crew Commander (Euro-Mir-95 Program).