Dan Grimaldi was born and raised on the streets of Brooklyn, New York. The diminutive actor, who stands 5'4", is part of the famous Grimaldi clan in Monaco. Dan is a thoroughly educated man outside show business; he holds three different degrees from three universities in New York. despite playing tough guy roles, he holds a bachelor’s degree in mathematics from Fordham University, a master’s degree in operations research from New York University, and a doctorate in data processing from the City University of New York. In fact, he teaches in the Department of Mathematics and Computer Science at Kingsborough Community College in Brooklyn, New York. He finished high school at Xaverian, before pursuing tertiary education.
Before his stint in HBO's The Sopranos, Grimaldi starred in several films in minor roles, and had guest appearances on TV shows such as Law & Order. However, his dual role as twins Philly and Patsy Parisi on The Sopranos remains his most recognizable trademark. He was also on the 1980 slasher flick Don’t Go in the House as pyromaniac Donald Kohler. He also did the voice for the bestselling computer game Mafia.
During his career, Grimaldi was able to work side by side with the industry’s best actors and directors, including The Yards with James Caan and Mark Wahlberg and director James Grey; The Stand-In with Judith Ivey and Kelly Ripa; North with Elijah Wood; Crooklyn with Alfre Woodward and director Spike Lee; and Mortal Sins with Anthony Lapaglia. Meanwhile, on television, he has paired up with Dennis Franz on NYPD Blue, Chris Noth and Paul Sorvino on Law and Order, plus several series and soaps such as All My Children and As the World Turns.
Grimaldi is proud of his Italian heritage, despite being born and raised on the streets of Brooklyn.