Multiple realities(covers information from several alternate timelines)
Ensign Hoy was a transporter operator serving aboard the USS Enterprise-D under Captain Jean-Luc Picard.
Hoy was on duty in shuttlebay 2 and oversaw the launching of Doctor Paul Stubbs' egg probe. (TNG: "Evolution")
In early 2366, Hoy beamed an away team down to Delta Rana IV. (TNG: "The Survivors")
A short time later, Captain Picard relieved Hoy of his station at the transporter controls, so that Picard alone could greet a Mintakan named Nuria after he beamed her up from the surface of Mintaka III. (TNG: "Who Watches The Watchers")
He visited Ten Forward when the Enterprise-D took the Romulan defector Alidar Jarok aboard. (TNG: "The Defector")
Off duty he shared a drink in Ten Forward when Q met Guinan in the bar. (TNG: "Deja Q")
In an alternate timeline created by the USS Enterprise-C Hoy served as transporter operator aboard the Enterprise-D. He beamed Lieutenant Richard Castillo back aboard the Enterprise-C following the death of Captain Rachel Garrett. (TNG: "Yesterday's Enterprise")
Hoy was played by an unknown actor.
Hoy was named by Picard in "Who Watches The Watchers".