Spencer Reid profiles serial killers, rapists, kidnappers, and the worst of the worst. He works criminal cases. He has an IQ of 187 and is a genius. He is an incredibly skilled profiler and understands neurodivergent people well, likely due to his own undiagnosed autism (although he will not admit to it). He is part of the Behavioral Analysis Unit of the FBI, along with Emily Prentiss, David Rossi, Aaron Hotchner, Derek Morgan, Jennifer Jareau, and Penelope Garcia.