British New York City-based actor Martin Ewens is best known for his work in film and TV, most notably for his appearance in Guy Ritchie's 'Sherlock Holmes', and his recurring role on Amazon's comedy series 'Red Oaks'. He has also played a wide array of characters, including Sid, a South African prisoner in CBS's Sci-Fi crime drama 'Person of Interest', a burned-out rocker on CBS's 'Blue Bloods', and a captured British soldier on AMC's period Revolutionary War series 'Turn: Washington's Spies'. In addition, Martin has worked on numerous nationwide commercial campaigns, appearing alongside Jerry Seinfeld and Superman for American Express, playing a hit man for Vonage, and a golfer in a MasterCard 'priceless' commercial. He has also worked extensively in voiceover and video games, including 'Grand Theft Auto'.