Professor Callahan is a middle-aged professor at Harvard Law School. He teaches Elle, Emmett, Vivienne, Warner, etc. There is a murder case that Callahan has and needs help on, so he picks Elle, Emmett, Vivienne and Warner as his interns on the case. Callahan picks Elle because he thinks that she is pretty, and hits on her later in the movie. Callahan ends up being fired by a suspect of the murder case as her lawyer and losing the case.