'' Beaver made his professional stage debut in October 1972, while still a college student, in
Rain, from
W. Somerset Maugham's short story, at the Oklahoma Theatre Center in
Oklahoma City, Oklahoma. After returning to Texas, he performed extensively in local theatre in the Dallas area, supporting himself as a film cleaner at a 16 mm film rental firm and as a stagehand for the Dallas Ballet. He joined the
Shakespeare Festival of Dallas in 1976, performing in numerous productions. In 1979, he was commissioned by
Actors Theatre of Louisville to write the first of three plays for that company (
Spades,
Sidekick and
Semper Fi), and was twice a finalist in the theatre's national Great American Play Contest (for
Once Upon a Single Bound and
Verdigris). Along with plays, he continued writing for film journals and for several years was a columnist, critic, and feature writer for the
National Board of Review of Motion Pictures magazine
Films in Review. Moving to New York City in 1979, Beaver worked steadily onstage in stock and on tour, simultaneously writing plays and researching a biography of actor
George Reeves. He continues to pursue this project between acting jobs. He appeared in starring roles in such plays as
The Hasty Heart and
The Rainmaker in
Birmingham, Alabama, and
The Lark in
Manchester, New Hampshire, and toured the country as Macduff in
Macbeth and in
The Last Meeting of the Knights of the White Magnolia. During this period, he ghostwrote the book
Movie Blockbusters for critic
Steven Scheuer. In 1983, he moved to
Los Angeles, California, to continue research on his biography of
George Reeves. He worked for a year as the film archivist for the Variety Arts Center. Following a reading of his play
Verdigris, he was asked to join the prestigious
Theatre West company in Hollywood, where he continues as an actor and playwright to this day.
Verdigris was produced to positive reviews in 1985 and Beaver was signed by the Triad Artists agency. He immediately began to work writing episodes of television series including
Alfred Hitchcock Presents (he received a 1987
CableACE Award nomination for his very first TV script for this show),
Tour of Duty and
Vietnam War Story. He also worked occasionally in small roles in films and television. The 1988
Writers Guild of America strike fundamentally altered the freelance television writing market, and Beaver's television writing career came to an abrupt halt. A chance meeting led to his being cast as the best friend of star
Bruce Willis in
Norman Jewison's drama about Vietnam veterans,
In Country, and his acting career began flourishing where his writing career had faltered. Beaver was the only actual Vietnam veteran among the principal cast of
In Country. Subsequently, he has appeared in many popular films, including
Sister Act,
Sliver,
Bad Girls,
Adaptation.,
Magnolia, and
The Life of David Gale. He starred in the television series
Thunder Alley as the comic sidekick to
Ed Asner, and as homicide cop Earl Gaddis on
Reasonable Doubts. He was also
French Stewart's sullen boss Happy Doug on the sitcom
3rd Rock from the Sun. In 2002, Beaver was cast as one of the stars of the ensemble Western drama
Deadwood in the role of Whitney Ellsworth, a goldminer whom he often described as "
Gabby Hayes with
Tourette syndrome". Ellsworth went from being a filth-covered reprobate to marrying the richest woman in town and becoming a beloved and stalwart figure in the community. Originally Ellsworth did not have a first name, but when it became necessary to provide one, Beaver requested he be named Whitney Ellsworth, after the producer of
George Reeves's
Adventures of Superman. He continued his long research for the Reeves biography, and in 2005 served as the historical and biographical consultant on the theatrical feature film about Reeves's death,
Hollywoodland. Beaver joined the cast of the HBO drama
John from Cincinnati in 2006, while simultaneously playing the recurring roles of
Bobby Singer on
Supernatural and Carter Reese on another HBO drama
Big Love, appearing at least once a season on
Supernatural. He then took on the role of Sheriff Charlie Mills in the CBS drama ''
Harper's Island. He recurred as the gun dealer Lawson on Breaking Bad and its prequel Better Call Saul'', and played Sheriff Shelby Parlow for three seasons on
FX's Justified. Following his acclaimed work in
Justified, Beaver had a starring role in
Guillermo del Toro's gothic ghost story feature film,
Crimson Peak, in a part del Toro wrote for him. He also had roles in the feature films
The Frontier and
Billy Boy. His memoir about the year after his wife's 2003 lung cancer diagnosis, titled ''Life's That Way
, was purchased in a preemptive bid by Putnam/Penguin publishers in the fall of 2007. Prior to publication in April, 2009, it was chosen for the Barnes & Noble Discover Great New Writers'' program for 2009. Beaver was nominated for Best Guest Performance in a Drama by the Broadcast Television Journalists' Association Critics' Choice Awards in 2013, for his performance as Sheriff Shelby Parlow on
Justified. He wrote and directed the short film
Night Riders (2013), based upon his play of the same title. In 2014, he was given the Lifetime Merit Award of the
Idyllwild International Festival of Cinema. Beaver studied acting with Clyde Ventura and Academy Award-winning actor
Maximilian Schell. In March 2015,
Theatre West presented a 30th anniversary revival of Beaver's play
Verdigris, with Beaver in a starring role. Actress
Maureen Stapleton played the leading role in a workshop of Beaver's play
Verdigris in 1985 at the
Berkshire Theatre Festival. In June, 2016, Beaver returned to the Festival to play Big Daddy in
Tennessee Williams's
Cat on a Hot Tin Roof. Since 2018, Beaver has portrayed Secretary of Defense/U.S. presidential candidate/U.S. President
Robert "Dakota Bob" Singer on the Amazon series
The Boys, produced by
Eric Kripke, creator of
Supernatural. Beaver's characters on
The Boys and
Supernatural share the same name. In March 2023, he reprised his role as Bobby Singer in
The Winchesters spinoff series. Beaver was awarded the 2023 Soaring Talent Award for Career Achievement by the
Tallgrass Film Festival. In addition to his film and television work, Beaver has, as of mid-2025, appeared in over 110 stage productions. ==Personal life==