Geoff Heise portrayed the roles of "Man" in Pilot - Part 1 and Exposé, and the "Doctor" in White Rabbit. Geoff Heise (sometimes credited as Geoffrey Heise) is a Hawaiian actor who has guest-starred in several television programs. He has appeared three episodes of Hawaii Five-O, an episode of Murder, She Wrote, three episodes of Magnum, P.I., two episodes of Step by Step, One West Waikiki, Baywatch and two episodes of Lost