He appeared in "Magnum, P.I." as Tom Selleck's friend and helicopter pilot Theodore "T.C." Calvin, who operates his own tourist charter, "Island Hoppers", from 1980 to 1988. He appeared in season five of "Las Vegas" as the billionaire friend of Montecito owner A.J. Cooper (Tom Selleck). Mosley came out of retirement and appeared on the Magnum, P.I. reboot episode "A Kiss Before Dying" as Booky, T.C.'s barber, on March 11, 2019. Stephen Hill, who played T.C. in the new series, said, "It is truly an honor for us to welcome an original cast member of "Magnum, P.I."; one who embodied the role of T.C. with such thoughtful and dignified talent."