Lieutenant Berkley was a male Human Starfleet officer in the 23rd century. He served aboard the USS Enterprise in 2266 under the command of Captain James T. Kirk, during an historic five-year mission which the starship undertook. He was one of the ship's transporter chiefs.
That same year, Berkley was operating the transporter console when a landing party returned from the planet M-113. He promised to bring Sturgeon home, after his body was found on the planet's surface. As well, he was seen in a corridor wearing a sciences division Starfleet uniform. (TOS: "The Man Trap")
Later that year, Berkley was operating the transporter console. He embarrassed himself in front of Kirk when he was unable to beam cargo to the Tantalus Penal Colony – and unable to explain the problem until reminded that his destination was a penal colony. At that point, he remembered the security force field in place around such facilities. Kirk advised Berkley to refamiliarize himself with the Manual on Penal Colony procedures. When research material destined for the Central Bureau of Penology in Stockholm was beamed aboard the ship, Berkley left the transporter room to get a vault assignment. (TOS: "Dagger of the Mind")