ANDY WEIR worked as a software engineer until his debut novel, The Martian, became a bestseller, allowing him to pursue his ambition of writing full-time. He has always been a space nerd, with interests in relativistic physics, orbital mechanics, and the history of manned spaceflight. SARAH ANDERSEN is a cartoonist, illustrator, and the author of several volumes based on her webcomic series Sarah's Scribbles, which is available on Tapas.io. In 2014, she received her bachelor's degree in art from the Maryland Institute College of Art. The Society of Illustrators has honored both her illustrating and cartooning skills.