ANDY WEIR built a career as a software engineer until the success of his debut novel, The Martian, allowed him to live out his dream of writing full-time. He is a lifelong space nerd and devoted hobbyist of subjects such as relativistic physics, orbital mechanics, and the history of manned spaceflight. SARAH ANDERSEN is a cartoonist, illustrator, and the author of numerous books based on her Sarah's Scribbles webcomic series published on Tapas.io. She graduated from the Maryland Institute College of Art in 2014. Both her illustration and cartooning work have been recognized by the Society of Illustrators.