Robert "Bob" Harper is a personal trainer and lifestyle personality best known for his appearances as a trainer on the NBC television series The Biggest Loser (United States).
Harper has worked as a personal trainer for several celebrity clients, including Jennifer Jason Leigh. He is featured as a trainer on the United States version of The Biggest Loser reality television series, and appeared on the first and third seasons The Biggest Loser:Australia. Harper also participated in The Biggest Loser DVD workout series.
Harper was born August 18, 1965 in Nashville, Tennessee and attended Austin Peay State University, Clarksville, TN.