(written from a Production point of view)
Morgan filmed his scenes for "Balance of Terror" on Monday 25 July 1966 at Desilu Stage 9. He filmed his scenes for "The Return of the Archons" on Wednesday 7 December 1966 and Thursday 8 December 1966 at the 40 Acres backlot. He filmed his scene for "Patterns of Force" on Wednesday 29 November 1967 at Paramount Pictures' "European town" backlot, and his scenes for "The Ultimate Computer" on Thursday 14 December 1967 at Stage 9. He filmed his scenes for "The Tholian Web" on Monday 5 August 1968, also at Stage 9.
He began his career playing one of Rick Nelson's fraternity brothers, Sean, on The Adventures of Ozzie and Harriet. He made one guest appearance as Sean in 1964 (with Bill Mumy), becoming a regular cast member in 1965 until the end of the series in 1966. Sean was a college buddy of casting director Joseph D'Agosta, who got him his roles on Star Trek.
His other television credits include Voyage to the Bottom of the Sea (1966, with "The Neutral Zone" guest Peter Mark Richman and Arch Whiting), CHiPs (1977, with Star Trek: Voyager guest Robert Pine), The Lucy Show (1968, with TOS recurring guest Barbara Babcock and VOY/ENT guest Robert Pine), Wiseguy (1987, with DS9 guest Jonathan Banks), and Unsub (with TNG/DS9 actress Jennifer Hetrick).
He appeared on Mannix three times: in 1968 (with VOY guest Joseph Campanella and "Patterns of Force" guest David Brian), and twice in 1970, with Robert Ito and Star Trek V: The Final Frontier actor Bill Quinn. He also appeared in the 1980 TV movie Reunion with Star Trek: Enterprise actress Joanna Cassidy.
His film credits include Vision Quest (1985, with TNG guests Jana Marie Hupp and Ronny Cox and Star Trek: Voyager guest Raphael Sbarge), What's Up, Doc? (1972, with Stefan Gierasch, Graham Jarvis and Kenneth Mars), and Harry and the Hendersons (1987, with William Frankfather, David Richards, John Bloom and Kevin Peter Hall).
Morgan eventually left acting to pursue a career in financial services and insurance. Today, he lives in Kalispell, Montana. 
Morgan was also erroneously credited in the first edition of the Star Trek Concordance in "The Paradise Syndrome". The part was actually played by John Lindesmith. Morgan was also credited for roles in "The Corbomite Maneuver" and "This Side of Paradise" that seem to have been cut.