Simon Talliwell

is the unsub in episode 2x08 "Not Alone".

Timeline: At least 2007 through 2009

Location: Yardston, OH; also Baltimore, MD, Washington, DC, Alexandria, VA and other places "all over the Midwest and the mid-Atlantic states." 

Age: unknown

Status: unknown

Gammanalysis
Crack: Unknown. In fact, he did not appear to be a gamma at all.

Manifestation: Controlling other anomaloids and possibly creating new ones from members of twelve-step groups

Victims: Madalyn Basuto, Peter Kaczmareck, Sandy Cramer

Current status: Dead, shot by Hafidha Gates