Christopher Sembroski

Christopher Sembroski (born August 28, 1979) is an American data engineer, Air Force veteran, and commercial astronaut. He flew to orbit on Inspiration4, a private spaceflight funded by billionaire Jared Isaacman.

Sembroski is an ex Blue Origin employee and was a crew member on the Inspiration4 mission. The spaceflight position was given to Sembroski by his friend Kyle Hippchen, as he was unable to accept the prize because he exceeded the weight limit of the Dragon vehicle.

Sembroski has long had an interest in space, being an amateur astronomer and rocketeer. Sembroski received the call sign "Hanks" during training.

He is featured on the cover of a Time magazine double issue with the rest of the crew of Inspiration4 in August 2021.

Career Sembroski grew up in Kannapolis, North Carolina. Sembroski worked as a data engineer for Lockheed Martin.

He is a member of the Association of Space Explorers. In 2026 he was selected as a global space fellow for the Karman Project.