Seamus Patrick Dever

Seamus Dever

Seamus Dever, a prominent figure in American TV acting, honed his craft under the guidance of esteemed stage art mentors in Pittsburgh and Moscow. His innate talent, combined with an environment rich in creativity, laid the foundation for a distinguished acting career. He is best known for his portrayal of Detective Kevin Ryan in the hit series “Castle.” His diverse acting portfolio extends to other notable series like “Without a Trace,” “The Rookie,” and “CSI: Crime Scene Investigation.”

What we know about this person

Full name:

Seamus Patrick Dever

Date of birth:

July 27, 1976

Zodiac sign:



Flint, Michigan, USA





Marital status:

Married to Juliana Dever




5' 8" (1.78 m)


165 lbs (75kg)


actor, producer

Early life

Born on July 27, 1976, in Flint, Michigan, Seamus Patrick Dever was raised in an academic family. His father, a teacher of literature and drama, and his mother, a history educator, nurtured his early interest in the arts. The family relocated to Bullhead City, Arizona, when Seamus was six. He attended Mohave High School, where he was deeply involved in extracurricular activities, including serving on the student council.

After high school, Dever pursued an education in radio journalism at Northern Arizona University. It was here that his passion for acting truly ignited. He actively participated in university theater productions, which led him to reassess his career path. Eager to delve deeper into acting, he successfully applied to both Carnegie Mellon University in Pittsburgh and the Chekhov Moscow Art Theatre School.


Jon Huertas and Seamus Dever in Castle


Seamus Dever first graced television screens in 1999 with a role in “Pensacola: Wings of Gold,” followed by a series of minor parts in various TV shows. In 2001, he earned a significant role in the thriller “Outside the Law,” and the next year, he featured in the romantic drama “Monkey Love,” starring Jeremy Renner. The ensuing years saw him appear in popular series like “Without a Trace,” “Cold Case,” “Charmed,” and “CSI: Crime Scene Investigation.” In 2005, Dever joined the cast of the thriller “Hollywoodland,” a story about the murder of a Hollywood icon, which garnered acclaim at the Venice Film Festival. The film starred notable actors like Adrien Brody, Ben Affleck, Bob Hoskins, and Phillip MacKenzie.

2008 marked a new chapter for Dever with a recurring role as Dr. Ian Devlin in “General Hospital,” one of television’s longest-running soap operas. His character featured in 45 episodes. Concurrently, he portrayed Dr. Chris Ferlinghetti in the drama series “Army Wives” and appeared in the daytime show “Good Day L.A.”

Dever’s breakthrough came with the role of Detective Kevin Ryan in “Castle” from 2009 to 2016. He brought to life a charismatic detective, formerly an undercover agent, as part of Beckett’s (Stana Katic) and Esposito’s (Jon Huertas) team. This role garnered him widespread recognition and propelled the series to great success over its eight seasons.

While starring in “Castle,” Dever continued to expand his acting repertoire. He guest-starred in series such as “Dark Blue,” “Titans,” and “The Rookie.” In 2020, he portrayed Russian Captain Alexei Goncharov in “NCIS: Los Angeles.” His most recent notable role was in 2022’s “Invitation to a Murder,” a detective thriller reminiscent of Agatha Christie’s finest work.

Seamus Patrick Dever Movies and TV Shows

  • 2022

    Kung Fu

    Max DeVeer

  • 2022

    Invitation to a Murder

    Lawrence Kane

  • 2019

    The Rookie

    Chaz Bachman

  • 2018–2019


    Trigon / Frank Finney

  • 2018


    Don Eichman

  • 2009–2016


    Kevin Ryan

  • 2008

    Mad Men


  • 2008

    Ghost Whisperer

    Rich Henderson

  • 2005–2008

    CSI: Crime Scene Investigation

    Drew Rich

  • 2005


    Mitchell Haines

Seamus Dever’s personal life and family

Dever’s personal life is equally fulfilling. He has been married to actress Juliana Dever since 2006. The couple, who met while studying at the Moscow Art Theatre, share both a professional and personal bond, with Juliana appearing in “Castle” as his character’s wife. They advocate vegetarianism and actively support the “Best Friends Animal Society.” Dever enjoys basketball, cycling, and boxing as hobbies.


Seamus Dever with wife Juliana Dever

Talk Shows

  • 2015

    Home & Family

    Role: Guest

  • 2012

    Chelsea Lately

    Role: Guest

Seamus Dever now

Today, Seamus Dever continues to make his mark in the television industry. He remains engaged in his craft, seeking out new and challenging roles. Recently, he has made guest appearances in series like “Kung Fu” and “NCIS: Hawai’i” and has been involved in the adventurous series “True Lies.”

Published: December 25, 2023
Updated: March 2, 2024