John Slattery (born August 13, 1962) is an American actor and director, best known for his role as Roger Sterling on AMC's series Mad Men.
Slattery was born in Boston, Massachusetts, to an Irish American family of six children. He was raised 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.
He 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, yet short lived, show K Street (TV series).; guest appearances as Sam Truman, Will's brother, on Will & Grace; guest appearances as Michael Cassidy, Amy's estranged husband, on Judging Amy,; guest appearances as urine fetish politician Bill Kelley on Sex and the City; principal Dennis Martino on Ed; and college president Peter Benedict on Jack and Bobby. In March 2007, he began a series of appearances on Desperate Housewives portraying a suitor to Gabrielle Solis (Eva Longoria Parker), later to be her husband, until his character's death in Season 4.