Peter MacKenzie (born January 19, 1961) is an American actor. In 1979, Peter took acting lessons in New York. He worked at a talent agency before deciding to work as an actor full time in 1984. His first major role was on Hermans Head. He is a character actor. He also played Mr. Firestein in the season 3 episode of The Drew Carey Show titled The Sex Drug, as Mimi Bobecks counsel in her sex harassment case against Nigel Wick, and co-starred in the 1987 film Firehouse. One of his minor roles was Mr. Sneed in Disneys Tom and Huck. He plays anti-war activist David Dellinger in the 2012 film The Chicago 8.