Sinclair was one of the museum guards at the Wieldstrom Museum. He was stationed outside the main entrance to Porter hall, the main part of the museum. He is a fairly jittery guard often having bad feelings about things, much to the uncaring altitude of his fellow guard.[1]
While Garrett was robbing the place in his quest for the Sentient Artifacts, Sinclair reported that he had a really bad feeling and felt that someone was watching him.