Bobby Finstock is head coach of the Beacon Hills High School lacrosse team. Also Scott and Stiles's Economics teacher. He has, apparently, only one testicle. He lost the other one to exposure.

His birthday is on October 30.

In 1x02 - Second Chance at First Line, Coach Finstock talks about his brother who was on meth. The drugs rotted his teeth out, but the brother got veneers. 

He particularly can't stand Greenberg. In 1x05 - The Tell, he claims that he likes to be called Cupcake.

Coach Finstock only knows one inspirational speech, the president's speech from Independence Day, and he always give it before their big game.

He is a recovering alcoholic who is 15 years sober.