Diego Klattenhoff

• Name — Diego Klattenhoff • Born — 30 November 1979 • Birthplace — French River, Nova Scotia, Canada • Occupation — Actor • Years Active — 2001–present

Klattenhoff was born in French River, Pictou County, Nova Scotia. He moved to Toronto at the age of 19 to pursue an acting career. For a number of years, he worked as a bartender while studying in theater workshops. His father was originally from Germany and settled in Canada before Klattenhoff was born.

Klattenhoff studied with some of Canada's most respected acting coaches, including David Rotenberg, Bruce Clayton and Rae Ellen Bodie. His first notable acting role was in Mean Girls (2004). He followed that with a string of appearances in notable TV shows like Smallville and Stargate SG-1, and films like Lucky Number Slevin (2006). Since 2006, he has been in recurring roles like Young Jacob in CBC Television's At the Hotel, Derek in CTV's Whistler, Ivan Palacinke in ABC's Men in Trees and Mike Callahan in NBC's Mercy. Klattenhoff appeared in Homeland as Mike Faber, a Marine Captain whose best friend returns to the U.S. after disappearing in Iraq eight years earlier. He and the cast were nominated once for a Screen Actors Guild Award for Best Cast, and twice for a PAAFTJ Television Awards for Best Cast in a Drama Series. He has also guest starred on television series such as Psych, Supernatural, 24, and Falling Skies. Klattenhoff starred in J. J. Abrams's television film Anatomy of Hope and appeared in the Guillermo del Toro film Pacific Rim (2013) and the sci-fi thriller After Earth (2013). In March 2013, Klattenhoff joined the cast of the NBC thriller The Blacklist, as FBI Special Agent Donald Ressler. The show premiered on September 23, 2013, to 12.6 million viewers. Klattenhoff starred in the Canadian science fiction film Radius (2017).

• Year — Title — Role — Notes • 2001–2002 — Doc — Jason — 2 episodes • 2002 — Witchblade — Uncredited — Episode: "Destiny" • 2003 — Wild Card — Episode: "Pilot" • 2003 — Mutant X — Janitor #1/Johnny Cummings — Episode: "Shadows of Darkness" • 2003 — Veritas: The Quest — Tymus — Episode: "Avalon" • 2004 — 1-800-Missing — Brad Whitman — Episode: "One Night Stand" • 2004 — Sue Thomas: F.B.Eye — Jason Albright — Episode: "The Bounty Hunter" • 2005 — Smallville — Josh Greenfield — Episode: "Krypto" • 2005 — Stargate SG-1 — Team Leader — Episode: "Ex Deus Machina" • 2006 — At the Hotel — Young Jacob — 6 episodes Recurring role (Season 1) • 2006 — Psych — Dylan Maxwell — Episode: "Speak Now or Forever Hold Your Piece" • 2006 — Supernatural — Duane Tanner — Episode: "Croatoan" • 2007 — Whistler — Derek — 12 episodes Recurring role (Season 2) • 2008 — Men in Trees — Ivan Palacinke — 6 episodes Recurring role (Season 2) • 2009 — data-sort-value="Listener, The" | The Listener — Tom Crawford — Episode: "Emotional Rescue" • 2009 — ER — Jay — Episode: "Shifting Equilibrium" • 2009 — 24 — Sergeant Cadden — 2 episodes • 2009–2010 — Mercy — Mike Callahan — 22 episodes Main role (Season 1) • 2011 — Falling Skies — Lieutenant Danner — Episode: "Mutiny" • 2012 — Longmire — Eli — Episode: "The Cancer" • 2011–2013 — Homeland — Mike Faber — 25 episodes Main role (Seasons 1–2) Guest role (Season 3) Nominated—Screen Actors Guild Award for Outstanding Performance by an Ensemble in a Drama Series • 2013–2023 — data-sort-value="Blacklist, The" | The Blacklist — Donald Ressler — 218 episodes Main role (Seasons 1–10) • 2024 — Blue Bloods — Officer Michael Tate — Episode: "Without Fear or Favor" • 2025 — Tracker — Roger McLaren — Episode: "The Mercy Seat" • 2026 — The Borderline