Parazynski is a veteran of five Space Shuttle flights STS-66, STS-86, STS-85, STS-100 and STS-120 as well as seven spacewalks. Parazynski’s final flight to orbit saw him conduct a daring and unplanned extra-vehicular activity or “spacewalk” to fix a damaged solar array. He left NASA in 2009 and is the only astronaut that has climbed to the summit of Mt. Everest.