John Cullum is an American actor and singer. He has appeared in many stage musicals and dramas, including Shenandoah and On the Twentieth Century, winning the Tony Award for Best Leading Actor in a Musical for each. In 1966 he gained his first Tony nomination as the lead in On a Clear Day You Can See Forever, in which he introduced the title song, and more recently received Tony nominations for Urinetown The Musical and as Best Featured Actor in the revival of 110 in the Shade.
Outside of the theatre world, Cullum is best known for his role as tavern owner Holling Vincoeur in the television drama series Northern Exposure, for which he was nominated for an Emmy Award for Best Supporting Actor in a Drama. He was featured in fifteen episodes of the NBC television series ER as Dr. Mark Greene's father. He played farmer Jim Dahlberg in the landmark television drama The Day After. He made multiple guest appearances on Law & Order and Law & Order: Special Victims Unit as attorney/judge Barry Moredock, and appeared as Big Mike in several episodes of The Middle. He appeared as Senator Beau Carpenter on the CBS series Madam Secretary.