Gareth Keenan is a fictional character played by Mackenzie Crook in the BBC sitcom The Office. His counterpart in the U.S. series is Dwight Schrute.
Personality
Gareth Keenan is the humorless Assistant Regional Manager at Wernham-Hogg Slough. He is gangly, gaunt, pompous and pedantic. Gareth is proud of his meaningless role as "Team Leader," and attempts unsuccessfully to assert imagined authority over his co-workers. Obsessed with his service in the Territorial Army, Gareth constantly brags about his supposed military skills: "I could catch a monkey. If I was starving I could. I'd make poison darts out of the poison of the deadly frogs. One milligram of that poison can kill a monkey. Or a man. Prick yourself and you'd be dead within a day. Or longer. Different frogs, different times." (Work Experience) Gareth's ignorance and overblown self-importance make him a target for practical jokes; his office nemesis, Tim Canterbury, plays endless pranks on him for fun. Gareth claims to be a great Casanova, but his frequent attempts to woo female co-workers are generally unsuccessful. He ultimately becomes regional manager following David Brent's departure from the branch in the Series Two Finale.