Chris Hadfield was the first Canadian astronaut to live aboard the International Space Station, spending almost 4,000 hours in space. Hadfield is one of the most experienced and accomplished astronauts in the world; he was responsible for the shuttle´s communications during 25 launches, was NASA's director of operations, chief of robotics at the Johnson Space Center, and chief of operations for the International Space Station. He also served as commander of the International Space Station where he led a record number of scientific experiments, in addition to becoming one of the most popular astronauts in history taking photos and recording educational videos about life in space, for which he has received much praise. His music video of his gravity-free version of David Bowie's Space Oddity is his most popular video.