What kind of accent does headmaster Charleston have?

I just re watched an episode where Michele says to Lorelai "a man with a weird accent" is on the phone for her, and I realized that yes, he has a strange accent. English is not my native language. I cannot spot the origin of this accent, either. Is this just American with a strange voice or a strange incantation? I cannot imagine this is British accent, is it?

I just re watched an episode where Michele says to Lorelai "a man with a weird accent" is on the phone for her, and I realized that yes, he has a strange accent. English is not my native language. I cannot spot the origin of this accent, either. Is this just American with a strange voice or a strange incantation? I cannot imagine this is British accent, is it?