Mark D, born Mark Randall, is a British artist and punk musician (guitarist and songwriter). He is also associated with the Stuckist group of artists.

Mark D was born and spent his childhood in Peterborough. He now lives in Nottingham. From university onwards, Mark D (D standing for "degenerate") played in various bands including the Fat Tulips, Confetti (when he was known as David), the Pleasure Heads (when he was known as Mark Randyhead), Oscar, Servalan and Sundress, and appeared on dozens of releases. He published and edited fanzines, including the underground C86 fanzine Two Pint Take Home. He is a co-owner of Heaven Records.

The Fat Tulips were formed in 1987 and have been described as "incredibly skilled in the art of buzzing electric guitars, ferocious tempos, pristine pop melodies and lyrics that weren’t nearly as sweet as they sounded at first listen."

A few years after the Fat Tulips broke up in the mid-1990s, he started a dealership in art and antiques with his wife, Tully, focusing on work from the 1960s and 1970s, including John Piper, Stig Lindberg, Lucienne Day and John Clappison.

Mark D'Onofrio is the Defensive Coordinator at the University of Miami and a former linebacker in the National Football League.

D'Onofrio was born Mark Emil D'Onofrio on March 17, 1969 in North Bergen, New Jersey. He is married with two children.

D'Onofrio played at the collegiate level with the Penn State Nittany Lions, where he was a team captain. In the 1992 NFL Draft, D'Onofrio was selected in the second round by the Green Bay Packers. He became a starter with the team that season, however a severe injury would cause him to retire soon after.

D'Onofrio's first coaching experience was as Linebackers Coach at Saint Peter's College. The next year he became a defensive assistant with the Georgia Bulldogs. From there he was a Linebackers Coach at with the Rutgers Scarlet Knights and Tight Ends, Special Teams, and Inside Linebackers Coach with the Virginia Cavaliers. He joined the Temple Owls in 2006, and followed head coach Al Golden to the University of Miami as defensive coordinator for the Miami Hurricanes football team in December 2010.

Professor Mark d'Inverno is a computer scientist at Goldsmiths, University of London, England.

Between 2007 and 2011 he was head of the Department of Computing.

D'Inverno has undertaken research in the area of formal methods, especially using the Z notation for software agents, and interdisciplinary work with artists and musicians. He is the co-author of the books Understanding Agent Systems and Agent-Based Software Development.

D'Inverno is also a jazz musician, playing keyboards. He has appeared at the National Theatre in London.