John M. Slattery Jr. (born August 13, 1962) is an American actor and director, best known for his role as Roger Sterling on AMC's series Mad Men. He has been nominated for many awards, and has won two SAG Awards with the Mad Men ensemble. Slattery was born in Boston, Massachusetts, to an Irish American family; he is one of six children. He was raised Roman Catholic. Slattery attended high school at St. Sebastian's School in Needham, Massachusetts. He later received a Bachelor of Fine Arts from The Catholic University of America in 1984. Apart from his role as Roger Sterling, Slattery is also known for roles such as union organizer Al Kahn on Homefront; Senator Walter Mondale in the HBO miniseries From the Earth to the Moon; as political adviser Tommy Flannigan in HBO's critically acclaimed show K Street; guest appearances as Will Truman's brother Sam on Will & Grace; guest appearances as Michael Cassidy, Amy's estranged husband, on Judging Amy; guest appearances as politician Bill Kelley on Sex and the City; principal Dennis Martino on Ed; and college president Peter Benedict on Jack and Bobby.