He began working with Dr. Reitman in 1987. [Tr. 109]. He has known Dr. Reitman for 23 years and considers him to be a friend. [Tr. 113]. Dr. Colaprete has an undergraduate degree in biology and chemistry. He then attended medical school, after which he completed a residency in emergency medicine, a fellowship in critical care medicine, and another residency in hyperbaric medicine. [Tr. 108].