Dr. Ben Leonardo is the Hobbs family's pediatrician. He was played by Jon Favreau.
After Walter bailed Buddy out of jail, he took Buddy to Dr. Leonardo for a DNA test. Leonardo managed to give Buddy a shot. The doctor soon confirmed that Buddy was Walter's son. The doctor convinced Walter to take Buddy home to meet his stepmother Emily and twelve-year-old half brother Michael. Leonardo agreed that Buddy was acting immaturely, but said that the latter's being with his family would help him to become mature. Walter asked if Buddy was insane, so Dr. Leonardo ran a psychological test on him.