The Supply Depot is run by Kelemen Totth, who has what may be a Transylvanian accent and is a sort of cross between Mr. Homn and Hagrid in appearance — which means that he is a very tall, broad, imposing man who is rather quiet and not quite as hairy and unkempt as Hagrid.
He has an amazing memory for agents' names and faces, and is able to remember vital information such as department, division, and number, as well as the type of creatures living in the agent's response center on their last visit.
Mr. Totth notes the agent's requests, then disappears behind the curtain for varying lengths of time. He eventually returns with all items in cloth bags marked Supply Depot. These bags can be returned by agents. This makes Mr. Totth happy.
He apparently lives in the Supply Depot, and is rarely, if ever, seen outside it. He wears some devices on his belt, but why or how they may help him in his job is not known at this time.