(written from a Production point of view)
Jeff Allin (born 15 October 1952; age 68) is an actor who guest starred in two episodes of Star Trek: The Next Generation and Star Trek: Voyager. He also appeared in the 1996 video game Star Trek: Borg. Allin filmed his scenes for "Imaginary Friend" between Wednesday 26 February 1992 and Friday 28 February 1992 and on Wednesday 4 March 1992 and Thursday 5 March 1992 on Paramount Stage 8, 9, and 16. His costume from his Voyager appearance was later sold off on the It's A Wrap! sale and auction on eBay.  In 1984, Allin married the future fellow TNG guest actress and recurring DS9 actress Ann Gillespie. 
Allin had previously worked with Kate Mulgrew in the 1985 action film Remo Williams: The Adventure Begins prior to his appearance on Voyager. Allin also worked with future Trek actors Armin Shimerman, James Cromwell, and Matt McCoy in the 1990 Television Film Miracle Landing, a dramatization of the ill-fated Aloha Airlines flight 243.