Sembroski — who works as an engineer with Lockheed Martin in Everett, Washington — was one of 72,000 people to enter a contest for the spot by donating to St. Jude Children's Research Hospital, based in Memphis, Tennessee. Initially, a college buddy who's remaining anonymous won the drawing, but couldn't go and asked that Sembroski take his place. The other members of the crew include Hayley Arceneaux, a 29-year-old physician assistant at St. Jude and a childhood cancer survivor, and Sian Proctor, a 51-year-old geology, sustainability and planetary science professor at South Mountain Community College. Combining cancer fight with space flight Isaacman has pledged to match up to $100 million for St. Jude as part of his mission, dubbed Inspiration4.