As McKenzie speaks about his job, it is a stunning Antarctic summer's day, a balmy -15C. The view outside his window is a vast expanse of white as far as the eye can see, smoothed over by an equally vast layer of pure blue.
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NASA's decision to bring the crew home one month early, on Jan. 15, marked the agency's first controlled medical evacuation from the station in its 25 years of continuous operations. The incident highlighted the limits of treating complex health problems 250 miles away from Earth.
Fincke, 58, is a Pennsylvania native with a wife and three children. He joined NASA in 1996 and is now a veteran of four spaceflights: Expedition 9 in 2004, Expedition 18 in 2009, STS-134 in 2011, and most recently Expedition 74, for which he served as commander.