From The Stargate Omnipedia
Doctor, probably a part of the Atlantis expedition. He is particularly fond of baked foods.
Trinity - When McKay sees Sheppard's reaction to the power of Project Arcturus, he cites Dr. Vogel as having a similar reaction to pastries.
Allies - With the expedition science team burning the midnight oil, Zelenka tells Sheppard that Dr. Vogel went to get them coffee.