Known for winning the main event world championship at the 1995 World Series of Poker. He has earned one World Poker Tour title, two WSOP bracelets, and over six million dollars in tournament cashes in his poker career. Harrington chose his own nickname "Action Dan" even though he is known for being a tight conservative player. He is a distant cousin to both professional golfer Pádraig Harrington and NFL quarterback Joey Harrington.
Dan Harrington has written (co-authored with Bill Robertie) three popular books on tournament poker, two books on cash no-limit games and one online cash games poker book, all published by Two Plus Two Publishing.