Mark Duplass is an American actor, filmmaker, and writer known for his work in independent films and television. He gained recognition for co-creating and starring in the acclaimed series The League and has appeared in various films such as The Puffy Chair and Creep. Duplass is also known for his collaborations with his brother, Jay Duplass, in producing and directing projects. In addition to his acting career, Duplass has been involved in producing numerous films and series, contributing to the rise of the "mumblecore" film movement. He has received praise for his work in both comedy and drama, showcasing his versatility as an artist.