Henry Grace

Henry Grace was a serial killer who posed as a college professor in the season 4 episode "Masterpiece".

Background
Henry was a child prodigy and has grown up to be a narcissistic intellectual. He is constantly quoting Shakespeare, chastising those less intelligent than he, and is a firm believer that Behavioral Science is a "junk science". He is met by the BAU team at Stayer University in Fredericksburg, VA. He appears to assist them in their investigation of seven missing women and children. His underlying motive, however, is to exact revenge on Agent David Rossi, who was responsible for the death of Henry's brother, William. Upon Henry's arrest (which will end in his execution), Rossi tells Henry to "say hello to [his] brother for me".

Modus Operandi
Henry killed his victims in various ways, but always disposed of their bodies with hydroflouric acid, which completely dissolves most organic compounds.

Known Victims
In "Masterpiece", it is revealed that Henry may have killed over 39 women; all of them unknown.