Lieutenant Commander Jerry Fleck was a 24th century Starfleet officer assigned to the USS Enterprise-D under Captain Jean-Luc Picard circa 2370.
In mid 2370, Lt. Cmdr. Fleck was assigned the living quarters across the hall from Counselor Deanna Troi. (ENT: "These Are the Voyages...")
Background
The character's name was placed on the door across the hall from Troi's quarters, on the sets rebuilt for filming the Star Trek: Enterprise finale, "These Are the Voyages...". The 24th century events of the episode were set during the events of TNG: "The Pegasus".
Lt. Cmdr. Fleck's name is not readable on screen, but is discussed in the text commentary by Michael and Denise Okuda.
The character is named for First Assistant Director Jerry Fleck, whose name was also used for the character of Ensign Jerry Fleck. Dates and rank establish that the two Fleck characters are not the same person, and have an unestablished relationship.