Christopher Sembroski (born August 28, 1979) is an American data engineer, Air Force veteran, and commercial astronaut.

[1] 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.

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

[1] During college, Sembroski volunteered for ProSpace, a nonprofit organization advocating for private spaceflight.

[5] Sembroski also was a counselor at Space Camp in Huntsville, Alabama which promotes science, technology, engineering, and math to children and teenagers.