Mary Ellen O'Toole, PhD retired from the FBI in 2009 where she worked as one of the FBI's most senior and accomplished profilers. During her career, she worked on many high-profile cases, including the Elizabeth Smart abduction, the Unabomber case, the Green River Killer, and the Natalee Holloway investigation. She teaches at the FBI National Academy, lectures at the prestigious Smithsonian Museum, and is a sought after speaker all over the world to law enforcement groups, government agencies, universities and schools.