Nicholson started out his career in the gaming industry in 1994 at Dreamforge where he worked on multiple titles as Lead Game designer, Lead Artist, Concept artist and Interface design/artist. He then moved on to Interplay in 2001. Nicholson also worked at other well-known video game companies including Sony Studios, Monolith, and Sigil Games Online. Nicholson was hired by Blizzard in October 2006.