Second City (Dan Aykroyd, John Belushi, Bill Murray, Gilda Radner, Rachel Dratch, Amy Poehler, Horatio Sanz) - known for their aesthetic perfectionism
Groundlings (Laraine Newman, Chris Farley, Will Ferrell, Julia Sweeney, Maya Rudolph, Chris Kattan) - creation of vivid and eccentric characters
Harvard Lampoon (Dennis McNicholas, Michael Schur, Conan OBrien) - emphasis on the conceptual premise of a sketch
Then Jimmy Fallon sums up the current writing staff well: [Fey]s Chicago. Dennis is Harvard. Shed do more jokes about having sex with a hobo, and hed do more jokes about robots and sharks."