Boen is also known to many TV viewers as the Harper family's pastor, Reverend Lloyd Meechum on the 1980s sitcom Mama's Family. His character was featured in several of the most memorable episodes (on both the network and syndicated versions). He also appeared as a clergyman in episodes of The Golden Girls, The Golden Palace, The Wonder Years, Boy Meets World, Seinfeld and Three's Company. He also appeared as Willie's boss in ALF. Other films in which he appeared include The Man with Two Brains (1983), Alien Nation (1988), Naked Gun 33⅓: The Final Insult (1994), and Nutty Professor II: The Klumps (2000). Boen commonly plays doctors in movie and television roles.

He is also a prolific voice actor. In 1987, came his first voice role as Taurus in the direct to video G.I. Joe: The Movie. Some of his most well known voice roles have been villainous pirate LeChuck from the Monkey Island series of adventure games. He has also provided the racial introductions for World of Warcraft and its expansions, voiced Magtheridon in World of Warcraft: The Burning Crusade and King Terenas Menethil II in World of Warcraft: Wrath of the Lich King, including the opening cinematic.

Boen retired from screen acting in 2003, but continues his work as a voice actor in radio, television cartoons and video games.

He was married to Carole Kean from 1970 until her death in 2001, when she died from ovarian cancer.