Ellen Stofan, who serves as chief scientist at NASA, has a job like no one else in this world—or on any other. She trained as a geologist, using radar data to study volcanic activity throughout the solar system. Today, however, she helps coordinate NASA’s scientific strategies across fields and disciplines. Sometimes that means reading through huge stacks of recent research, other times it’s about carrying NASA’s message to the public. To help us better understand what she does, she took us through a typical day—and offered some exciting suggestions about where NASA might be headed.