Oleg Kononenko

Oleg Dmitriyevich Kononenko was born on June 21, 1964, in Chardzhou, in the Turkmen republic of the Soviet Union. He earned an engineering degree from the Kharkov Aviation Institute and went to work at the TsSKB-Progress design bureau in Samara (then Kuybyshev), where he designed spacecraft electrical power systems and rose to a leading design engineer role. That deep engineering background shaped his path to space: he was selected as a cosmonaut candidate in 1996 and, after training at the Gagarin Cosmonaut Training Center, was certified as a test cosmonaut in 1998. A keen photographer and reader, he even carried a Yakut khomus, a traditional mouth harp, into orbit and played it in microgravity.

Kononenko has flown five long-duration missions to the International Space Station. He debuted in April 2008 on Soyuz TMA-12 as a flight engineer for Expedition 17, then returned in 2011 as a flight engineer on Expedition 30 and commander of Expedition 31. His third flight in 2015 saw him serve on Expeditions 44 and 45, and his fourth, launching in 2018, made him commander of Expeditions 58 and 59. His fifth and longest mission began on September 15, 2023, aboard Soyuz MS-24; serving as commander of Expedition 71, he spent 374 continuous days aloft before landing in September 2024. Across these flights he has performed several spacewalks and accumulated an extraordinary tally of hours in orbit, the byproduct of repeatedly volunteering for the longest available assignments.

On February 4, 2024, during that final expedition, Kononenko surpassed Gennady Padalka's mark of 878 days to become the all-time leader in cumulative time in space. He went further still, becoming on June 4, 2024, the first human ever to spend 1,000 cumulative days off Earth, and continued adding to the record before returning home. A Hero of the Russian Federation, he has framed his own endurance as data for the future — insight that could one day help crews survive the long transit to Mars. He remains an active cosmonaut and one of the most experienced spacefarers in history, his name now attached to milestones no one had reached before.