Darrell Gervasi was a Human male of a stocky build. He also had a shaved head and large biceps. Gervasi was a Lieutenant in Starfleet and served aboard the USS Defiant as a security officer.
In January 2377, he was one of several Defiant security personnel who beamed down to Harkoum to capture Taran'atar and return him to Deep Space 9. Gervasi wore the surface operations uniform and also had a backpack for the team containing supplies. Gervasi and the others exchanged phaser fire with Iliana Ghemor and her mercenaries. (DS9 novel: Warpath)