Reginald Barclay
- Full Name: Reginald Endicott Barclay III
- Species: Human
- Gender: Male
- 2366: Lieutenant junior grade, diagnostic engineer, Starfleet; USS Zhukov (TNG: "Hollow Pursuits")
- October 2366: Lieutenant junior grade, diagnostic engineer, Starfleet; USS Enterprise (TNG: "Hollow Pursuits")
- Still serving as of July 2371 (TNG: "The Nth Degree", "Realm of Fear", "Ship in a Bottle", "Genesis"; TNG Short Story: "Thinking of You"; TNG Comic: "Perchance to Dream")
- Late 2370: Lieutenant junior grade, diagnostic engineer, Starfleet; Jupiter Station (VOY: "Projections")
- Assigned to original Emergency Medical Hologram project, interpersonal subroutine evaluation (VOY: "Projections")
- By 2372: Lieutenant, diagnostic engineer, Starfleet; USS Enterprise (Star Trek: First Contact)
- By June 2374: Holographic engineer, Starfleet; Jupiter Station (TNG Novel: Immortal Coil)
- June 2374: Holographic engineer, Starfleet; Daystrom Institute, Galor IV annex (TNG Novel: Immortal Coil)
- Liaison to Lewis Zimmerman (TNG Novel: Immortal Coil)
- Assigned through September 2374 (TNG Novel: Immortal Coil)
- By April 2376: Lieutenant, diagnostic engineer, Starfleet; Pathfinder Project, Starfleet Communications (VOY: "Pathfinder", "Life Line", "Inside Man", "Author, Author", "Endgame")
- Lived in his current apartment "almost two years" as of April 2376 per "Pathfinder"; conflicts with Immortal Coil, but this could be one he moved into when assigned to Jupiter Station