Glen is the maitre D'at a restaurant that the Hofstadters are planning their Valentine's Day dinner at. There is an hour's wait even after Leonard asks for more help asking in a bad ass fashion. Penny decides to flirt with him and he calls her "ma'am". Penny laughs that she doesn't have to since they are basically the same age. He's twenty-one and then asks how old Penny is. (31). She gets mad and drags Leonard out while she is still young.
He appeared in "The Valentino Submergence".