Daniel Peter Masterson (born March 13, 1976) is an American actor and disc jockey. Masterson is known for his roles as Steven Hyde in That '70s Show (1998–2006) and as Jameson "Rooster" Bennett in The Ranch (2016–2017).
Masterson was born on Long Island, New York, the son of Carol, a manager, and Peter Masterson, an insurance agent. He grew up in Garden City and East Williston, New York. He has one brother, actor Christopher Masterson. Their maternal half siblings Jordan Masterson and Alanna Masterson are actors.
A child model from age 4, who was featured in magazine articles as well as television commercials beginning at age 5, Masterson starred in musicals as a child at the age of eight, and began acting as well. His singing voice "disappeared" by the time he was a teenager. By the time he was sixteen, he had appeared in over one-hundred commercials, including ones for Swift Premium, Kellogg's Frosted Flakes, Hardee's, Hostess, Tang, and Clearasil.