He plays guitar and records songs with mainstream musicians from orbit, speaks Russian and French, was a former test pilot (he attended the USAF Test Pilot School at Edwards Air Force Base where he was granted the Liethen-Tittle Award for top pilot graduate and was named Top US Navy Test Pilot Of The Year in 1991), has a degree in mechanical engineering and a masters in avionics and the list goes on.
He's been regularly tweeting from the ISS and has a growing portfolio of incredible pictures he takes each day. He even shares a few humorous tweets with William Shatner and other Trek cast members (telling 'Wesley Crusher' he's "not supposed to be on the bridge and should go back to engineering") or Shatner that the ISS is "maintaining standard orbit, Captain".
He's gone from nothing to over half a million followers and growing, so I'm doing my bit to see how fast he can hit 1 million. He's someone who's actually worth following as opposed to the useless celebrities tweeting about whose party they're attending or what designer dress they just bought.
@Cmdr_Hadfield if you're interested.