Eric Christian Olsen (born May 31, 1977) is an American actor, writer and producer. He is known for his portrayals of Investigator Marty Deeks on the CBS television series NCIS: Los Angeles, Austin in the film Not Another Teen Movie, Lloyd Christmas in Dumb and Dumberer: When Harry Met Lloyd and as producer/executive producer on the 2024 reboot of Matlock.

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He is an American actor and producer who rose to prominence through his roles in early 2000s comedies and sustained a long-running television career as a lead on NCIS: Los Angeles.
He is widely recognized for playing Investigator Marty Deeks on the CBS series NCIS: Los Angeles, as well as his roles in films like Not Another Teen Movie and Dumb and Dumberer: When Harry Met Lloyd.
Yes, he has expanded his career into producing, notably serving as an executive producer for the 2024 television reboot of Matlock.