Allan Havey is an American actor, comedian, writer, and talk show host. He was the host, writer and executive producer of Night After Night with Allan Havey, which aired on The Comedy Channel from 1989-1992. He made numerous appearances on the David Letterman show (on both CBS and NBC) and created two Cable Ace Award nominated performances for HBO, "One Night Stand" and "Command Performance". He's known for portraying Lou Avery on AMC's "Mad Men" and made 36 appearances as Karl Allerd on Showtime's "Billions". Sean Collins of the NY Times said of Allan's performance "as always, a perfectly laid-back foil for Paul Giamatti's measured bombast." Additional television appearances include LOOT, GLOW, Two Broke Girls, Man in the High Castle, LOVE, Bosch, Seinfeld, and Curb Your Enthusiasm. He guest starred in the Coen brothers film Hail Caesar with Josh Brolin; Steven Soderberg's The Informant with Matt Damon; Mike Figgis' Internal Affairs with Richard Gere; and David Leland's Checking Out with Jeff Daniels. Other films include Rounders, Knockaround Guys, Plus One, Love or Money, and Bombshell.