Dr. Trevor Grant was an assistant to Albert Einstein in the late 1940s, when Eureka was a military base. He is first seen in the season 4 premiere, when five Eureka citizens get teleported back into 1947. He assists them to return but, before they leave, Jack Carter tells Allison Blake "he left his device in another jacket" (still in 1947). At the end of the episode, Dr. Grant is in 2010 Eureka, and it is assumed he was transported there accidentally with Jack's device; however, it is later revealed that he took the time travel device on purpose and reconfigured it to work for him. Grant sees no reason not to indulge his scientific curiosity, even when it endangers himself and others.