Derek Richardson Jr. (born January 18, 1976) is an American actor. He is best known for his TV roles on Men in Trees and Anger Management, and for starring as young Harry Dunne in the film Dumb and Dumberer: When Harry Met Lloyd.
Early life Richardson was born in Queensbury, New York, the eldest of the five children of Ellen and Dr. Derek Richardson, a dermatologist.
Career Richardson's first screen work was in New York in 2000, appearing in one episode each of Strangers with Candy and Law & Order.
He moved to Los Angeles in 2002, to pursue his career. His first role was that year, in a two episode run as Keri Russell's love interest of the week, late in the final season of Felicity. He subsequently co-starred in the prequel to the Dumb and Dumber franchise Dumb and Dumberer: When Harry Met Lloyd as a younger version of Jeff Daniels' character, Harry Dunne.
Richardson starred as one of the leads in the horror film Hostel, earning a 2006 MTV Movie Award nomination for "Best Frightened Performance". In 2006, he began starring as Patrick Bachelor in the series Men in Trees.
From 2012–14, he played Nolan Johnson on all 100 episodes of Anger Management and portrayed California Governor Ronald Reagan's speechwriter (and later congressman) Dana Rohrabacher in the 2024 biopic Reagan.
In 2025, he played Detective Dundee in the Season 3, Episode 3 of Tracker
Filmography Year Title Role Notes 2000 Strangers with Candy Jared Episode: "Jerri's Burning Issue" Law & Order Brad Wilder Episode: "Black, White and Blue" 2002 Felicity Adam Davis 2 episodes 2003 Dumb and Dumberer: When Harry Met Lloyd Harry Dunne Nominated – Golden Raspberry Award for Worst Screen Couple 2004 Bring It On Again Party Guy 2005 Hostel Josh Brooks Nominated – MTV Movie Award for Best Frightened Performance Reeker Nelson 2006 Men in Trees Patrick Bachelor Main cast 2007 Hostel: Part II Josh Brooks 2008 What Makes Alex Tick Alex Young Short film 2009 House Steve Alkateen / Freedom Master Episode "Broken" Prep & Landing Lanny (voice) Television special 2010 Prep & Landing: Operation: Secret Santa Lanny (voice) Television special 2011 Prep & Landing: Naughty vs. Nice Lanny (voice) Television special American Horror Story Harry Goodman Episode: "Smoldering Children" 2012 Psych Danny Smith Episode: "Shawn and the Real Girl" 2012–2014 Anger Management Nolan Johnson Main cast 2013 The Power of Few Shane 2016 Der Island-Krimi Árni 2017 Lethal Weapon Jonah Episode: "Fools Rush In" 2020 Home Wade 2021 Fear the Walking Dead Fred Episode: "Six Hours" A Million Little Things Stephen Episode: "The Things We Keep Inside" 2023 Welcome to Flatch Lloyd 3 episodes 2024 Reagan Dana Rohrabacher 2024 High Potential Eric Barton Episode: "Hangover" 2025 Tracker Detective Dundee Episode: "First Fire" 2025 Prep & Landing: The Snowball Protocol Lanny (voice) Television special2026 The Night Agent Younger Jacob Monroe Episode: "Once Upon a Time..."
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