(written from a Production point of view)
Steve D'Errico worked on Paramount Pictures set security for Star Trek: Voyager, Star Trek: Insurrection, and Star Trek: Enterprise. He appeared in the ENT fourth season episodes, "Demons" and "Terra Prime", as an Earth Starfleet admiral and received no credit for his work. His trousers were re-used, previously worn by Vaughn Armstrong and later sold off at the It's A Wrap! sale and auction on eBay. 
D'Errico joined Paramount and Star Trek on 1 January 1998 as a set security officer. Before this, he worked as a security officer for several shopping malls in Southern California. He sold a story idea for an episode of Voyager's seventh season which was not realized.
He is a big Star Trek: Deep Space Nine fan. His favorite character is Benjamin Sisko and his favorite episode is "In the Pale Moonlight", followed by the Star Trek: The Next Generation episodes "The Measure Of A Man", "The Drumhead", and "The Pegasus".
After wrapping Enterprise he is still working for Paramount. Together with fellow Star Trek set security officer L.Z. Ward he did the security for the film Mission: Impossible III in 2006.