Dr. Kevin Hartkans (or according to IMDb - Hartkins) was a member of the group called "The Trust" and a Gateroom technician in Stargate Command.
Very little is known about Kevin's past except that he was born in 1969 in the city of Lubbock, Texas. (SG1: "Endgame")
In 2004, after seven months working for the SGC, he planted a beacon on the Stargate so the Trust could steal it. He went missing after that and his further fate is unknown. (SG1: "Endgame")