Terry Ahern was a member of Starfleet in the 24th century.

Ahern was listed on the dedication plaque of the starship USS Defiant on stardate 47538.5, in the group of names of representatives from Starfleet Research and Development. (Star Trek: Deep Space Nine set artwork)

In 2375, Ahern was credited on a plaque as part of the R&D crew of newly constructed USS Sao Paulo. (DS9: "The Dogs of War" set artwork)