Markham Anderson is a voice actor known for his work in English dubs of anime and for his extensive career in voiceover for commercials, video games, and animated properties. He provided the voice for the lead character, Colonel John Blade, in the 2000 original video animation Sin: The Movie. This anime, a adaptation of the video game of the same title, was a U.S.-Japanese co-production released by ADV Films.

Anderson's path to voice acting was informed by a diverse professional background. He served as a U.S. Marine, an experience that included an assignment with a Special Boat Squadron supporting SEAL Team Three. He later worked as a police officer, bounty hunter, and private detective. He has noted that his upbringing in a family with a father who was a Houston police officer and a grandfather who was a prison warden, combined with his own military service, helped him connect with tough, authoritative characters like Colonel Blade.

His entry into voice work began after a career in television and radio. Starting in television commercials in California during the early 1990s, he later moved to Texas and worked in radio. It was there that he began using his skill for celebrity impersonations in commercials, which gradually developed into a full-time voiceover career from his home studio in Grand Blanc, Michigan. His professional training includes a Bachelor of Arts in English from San Diego State University and a Broadcast Degree, as well as voice lessons from Bob Ford Productions in Houston.

Beyond Sin: The Movie, Anderson's voice acting in anime includes the role of M. Bison in Street Fighter and various characters in A.D. Police and Gasaraki. A significant portion of his career has also involved providing character voices for major animation studios. He is well-known as the voice of Fred Flintstone for Hanna-Barbera and Warner Bros.-licensed toys, computer chips, and games. His commercial and narration clients have included major companies such as Coca-Cola, Ford Motor Company, General Motors, The Learning Channel, Cartoon Network, Nickelodeon, Comedy Central, Sony, and Fox Sports.

In addition to his character work, Anderson is a skilled celebrity impersonator, with a repertoire of over seventy impressions. His portfolio includes voices ranging from Sean Connery and Arnold Schwarzenegger to US Presidents Ronald Reagan and Bill Clinton, as well as characters from Monty Python. He describes his natural vocal quality as a "guy next door" and emphasizes an interpretive approach to voice acting, preferring to absorb the material and provide an honest reading rather than forcing an affected vocal performance.