Garvin Elkins

Lieutenant Garvin Elkins was a 24th century Human man and officer in Starfleet, serving as Chief engineer of the Federation starship USS Demeter (NCC-79914), an agrobiology ship attached to the Project Full Circle fleet. 

Lt. Elkins was originally a civilian engineer; in fact, he helped design and build the Theophrastus class starship and later renovated the Demeter with a quantum slipstream drive as well as bringing it up to the specifications required for it to serve as a Starfleet vessel. It was only due to his longstanding friendship with Commander Liam O'Donnell that Elkins agreed to serve as Demeter 's Chief Engineer (which came with a Starfleet commission as a Lieutenant).