Earned a degree in finance from Georgetown University and worked as a litigation consultant in Florida before switching careers
Performed first stand-up routine in 1991, and then spent four years scripting commercials and studying acting
First appearance on David Letterman's show garnered Gaffigan acclaim and an offer to develop the sitcom Welcome to New York, which was canceled after three months
Has appeared in more than 200 commercials, including campaigns for Saturn, ESPNews, Energizer, Barnes & Noble
com, Kodak and Rolling Rock
His commanding presence in commercials earned him the title "Salesman of the Year" by Business Week in 1999
Appeared in two movies chosen for the 2001 Sundance Film Festival: Super Troopers and Thirty Years to Life
Featured in a Late Night with Conan O'Brien animated series called Pale Force
Made his Broadway debut in 2011 in That Championship Season, opposite Brian Cox, Chris Noth, Jason Patric and Kiefer Sutherland