A bartender at VA-11 Hall-A until his death. After drinking what he believed to be a "levitation potion" he jumped off a building and died.
In the prologue section of the game, Dana actually reveals that the levitation potion worked but Robert could not stop rising and ended getting hit by a plane.
His identity has since been taken up by Gillian, his successor at VA-11 Hall-A, for reasons unknown.