|Portrayed by Stephen Tobolowsky|
|First seen||Competitive Wine Tasting|
|At Greendale to...||...To explain who was really the boss|
|“||The answer is not quite that simple, Mr. Abed. Few are.||”|
Professor Peter Sheffield is the instructor of a class at Greendale based on the TV show Who's the Boss?. Having studied the show and written a book with deep analysis of its intricacies, he is considered the foremost authority on the subject matter—that is to say, until Abed signs up for his class and conclusively proves that in 81.82% of all situations of social hierarchy, Angela is "the boss". His first and only appearance was in "Competitive Wine Tasting". He is portrayed by actor Stephen Tobolowsky.