Jack Steven Irons (born July 18, 1962) is an American musician, best known as the founding drummer of American rock band Red Hot Chili Peppers, and the former drummer of Pearl Jam, Eleven and The Wallflowers. He has worked with Joe Strummer and The Latino Rockabilly War, Redd Kross, Raging Slab, Spinnerette and The Les Claypool Frog Brigade.