Commander Dennehy was a Starfleet officer who served aboard the USS Enterprise at some point during the 2270s.

In 2293, Dennehy attended James T. Kirk's memorial service in the grounds of Starfleet Academy, along with many other former Enterprise crewmembers. (TOS novel: Crucible: The Fire and the Rose)

USS Enterprise (NCC-1701) miscellaneous personnel
original configuration crew (2240s-2260s)	Adamski • Agbadudu • Arbee • Bartholomew • Bates • Beaumont • Brenner • Calder • Castanuela • Chang • Chase • Chesterton • Crandall • Dean • Denton • Dick • Eckert • Ellis • Ferriter • Foster • Garvey • Hunt • Ix • Jackson • Jakorski • Johnson • Karras • Kent • Kukar • Kulessa • Livinger • Loi • M'Gura • M'turr • Mancuso • Margolis • Moody • Piper • Reyes • Rosen • Sarda • Sellers • Shaw • Sikh • Smith • Taylor • Thomkins • Tomlinson • Trawley • Vuong • Ybarra • York
refit configuration crew (2270s-2280s)	Abernathy • Ahrens • Aledort • Austin • Bearclaw • Bischoff • Brand • Brassard • Canfield • Claremont • Croy • Deckert • Dennehy • Eisenberg • Feder • Foster • Khalifa • Korren • Langsam • Lihwa • Litt • London • Lydia • Diane Maass • Donald Maass • Malkson • Miñambrés • Oranjeboom • Remner • Rogers • Rotsler • Saavik • Trenjan • Welkin • Zaand
see also: administrative personnel • communications personnel • engineering personnel • medical personnel • pilots & flight control personnel • security & tactical personnel • sciences personnel • senior staff • unnamed