Clayton was a male Human in Starfleet in the late 23rd century. As of 2296, he held the rank of Lieutenant, and served as a science officer of the USS Intrepid II under Captain Spock, with a speciality in applied agriculture. (TOS novel: Vulcan's Forge)

Intrepid personnel
Intrepid (Intrepid-class prototype)	C. Ramirez • M. Reed (alternate timeline)	Intrepid (NX-07, NX-class)	J. Lambert
USS Intrepid (NCC-1631, Constitution-class)	Garth • Spiak	USS Intrepid II (Constitution-class)	Setek • Sehlk • Si'jsk • Sobek • Suvuk • T'Kiha • T'Leiar • T'Noy
USS Intrepid II (Oberth-class)	Atherton • Clayton • Diver • Duchamps • L. McCoy • F. Mercier • Richards • Spock • N. Uhura
USS Intrepid (NCC-38907, Excelsior-class)	D. Dieghan • S. Rozhenko • J. Tavares • Tobias	USS Intrepid (NCC-74600, Intrepid-class prototype)	W. Emick • J. Hayek • D. Kaplan • T. Riley • V. Stadi