Seamus Dever Biography

Seamus Dever is an American actor known for his role as Detective Kevin Ryan on ABC’s ‘Castle’. He has appeared in various films, short films, and video games. Born in Flint, Michigan and raised in Bullhead City, Arizona, Dever began his acting career at a young age. After graduating from Mohave High School, he pursued his undergraduate degree at Northern Arizona University. Dever’s passion for acting led him to earn MFAs in acting from Moscow Art Theatre and Carnegie-Mellon University. He made his adult acting debut in 1999 and has since been active in both television and film. Dever is a lifetime member of the Actors Studio and is married to his ‘Castle’ co-star, Juliana. He is also a dedicated supporter of the Best Friends Animal Society and follows a vegetarian lifestyle.

Quick Facts

  • Also Known As: Seamus Patrick Dever
  • Age: 47 Years, 47 Year Old Males
  • Family:
    • Spouse/Ex-: Juliana Dever (m. 2006)
    • Father: James Dever
    • Mother: Diana Dever
  • Born Country: United States
  • Height: 5’10” (178 cm), 5’10” Males
  • Notable Alumni: Moscow Art Theatre, Northern Arizona University
  • City: Flint, Michigan
  • U.S. State: Michigan
  • Education: Carnegie Mellon University, Northern Arizona University, Moscow Art Theatre


Seamus Dever began his career as an actor in 1999 with a guest appearance in the TV show ‘Pensacola: Wings of Gold’. He went on to make guest appearances in other dramas such as ‘She’s No Angel’ and ‘Undressed’. In 2002, he played Rick Michell in the action film ‘Outside the Law’. He also lent his voice to multiple characters in the video game ‘Soldier of Fortune II: Double Helix’.

In 2005, Dever appeared in the TV movie ‘Mystery Woman: Snapshot’ as Billy. The movie revolves around a bookstore owner who solves real-life mysteries. A year later, he starred in the period mystery film ‘Hollywoodland’, which is based on the mysterious death of actor George Reeves.

Dever’s television career took off in 2008 when he played Dr. Ian Devlin in the medical drama ‘General Hospital’. He also appeared in the series ‘Army Wives’ that year. His career reached new heights the following year when he landed the role of Detective Kevin Ryan in the crime-comedy drama series ‘Castle’. Interestingly, his wife, Juliana, also appeared in the show as his on-screen wife.

In 2009, Dever appeared in the independent comedy film ‘Ready or Not’ as Marc. The film follows a group of college friends who get stranded in a foreign country during a bachelor party. Over the years, Dever made guest appearances in various television shows, including ‘Dark Blue’, ‘Chelsea Lately’, and ‘The Chase’. In 2018, he had guest roles in the drama series ‘Legion’ and ‘Take Two’, a recurring role in the web TV series ‘Titans’, and a voice role in the video game ‘Far Cry 5’.

Family & Personal Life

Seamus Dever was born on July 27, 1976, in Flint, Michigan, USA. His mother was a history professor and his father was a drama teacher. He attended Mohave High School and later earned his undergraduate degree from Northern Arizona University. He then pursued his MFA in acting from the prestigious Moscow Art Theatre.

On May 27, 2006, Dever married actress Juliana Dever. The couple follows a vegetarian lifestyle. Interestingly, Dever is a cousin of Canadian singer-songwriter Feist and Broadway actress Jeanne Arnold.

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