Ushah is the primary medical doctor in the town of Greenvale. He is the coroner that performs Anna Grahm's autopsy, but only after Agent York proves his worth in a chess puzzle.
According to Fiona, Ushah made a small fortune in his Los Angeles practice and retired to Greenvale to practice research medicine. His favorite activities include chess puzzles and eating potato chips. He may be a medical whiz, but he can be a little tactless in his diagnoses, as York points out when Ushah greets him with "You look a little pale". He never reciprocates Fiona's advances because of his awkwardness at never having a girlfriend before.