David Madden (born June 13, 1981) is currently a full-time volunteer, best known publicly as a contestant on the television game show Jeopardy! Between July 5, 2005 and September 19, 2005 Madden won nineteen games and $432,400, both records only exceeded by Ken Jennings in regular season Jeopardy! His total Jeopardy! winnings of $442,400 (adding $10,000 for the 2006 Tournament of Champions) is fourth all-time, behind Brad Rutter, Ken Jennings, and Jerome Vered.

During his time at Ridgewood High in New Jersey, he competed on his school's Quiz Bowl team, and attended the National Academic Championship, where he was named to the Hall of Fame, being one of only 18 people named to it in its 25 year history.

Madden's play was noted for many runaway or lock games, strategic wagers, and the selection of higher valued clues when approaching a category, in an effort to "fish" for the Daily Doubles. His nineteen-game streak came to an end on September 19, 2005, when he was defeated by Victoria Groce, a musician from Decatur, Georgia. Steve Kaltenbaugh, a U.S. Navy sailor from Columbia, Maryland, finished third.

During the 2006 Tournament of Champions, Madden won his first round match (defeating the eventual winner of the Tournament, Michael Falk), but in his second round match, Madden entered Final Jeopardy in a distant third place, trailing Bill MacDonald $22,600 to $4,600. Instead of answering the Final Jeopardy question, he wished "Good Luck" to MacDonald on the answer screen and finished with $0.

Madden also holds two other achievements of note relating to his run on Jeopardy! Throughout his 22 games (including two in the 2006 Tournament of Champions) he selected 46 clues that were Daily Doubles and got only 2 incorrect. Madden is also believed to be the longest ever "real-time" champion since he taped his first show on December 14, 2004 and his last regular season show on July 9, 2005. During much of this time, Jeopardy! was either taping the Ultimate Tournament of Champions or on summer hiatus.

Madden studied at Princeton and Berlin and is a co-author of the forthcoming catalogue raisonné of the American artist Richard Anuszkiewicz which will be published in 2008. Currently he is hiking the length of the United States as a fundraiser for the Fisher House Foundation, a charity that provides free accommodations for family members of veterans at American military hospitals. He is originally from Ridgewood, New Jersey.

David Madden is an Australian entrepreneur associated with progressive causes. He is a co-founder of GetUp! a web-based political movement, and AVAAZ.org, a global advocacy movement.

Madden grew up in Canberra and served as an Army officer before studying Arts and Law at the University of New South Wales in Sydney. Madden served as president of the University of New South Wales Student Guild after defeating the Labor Left candidate in a landslide.

After winning the University Medal in History, Madden was awarded Fulbright and Frank Knox scholarships to study at Harvard University. At Harvard, Madden graduated in Law and completed a Master in Public Policy.

Madden has worked for the World Bank in Timor Leste, and for the United Nations in Indonesia. He is the co-author of Imagining Australia: Ideas for Our Future (Allen & Unwin, 2004).

In 2004, Madden was one of the founders of Win Back Respect, a web-based campaign against the foreign policy of United States President George W. Bush. The following year, together with Jeremy Heimans, he co-founded GetUp!, a similar campaign against the recently re-elected Howard government in Australia. Madden and Heimans subsequently co-founded AVAAZ.org.

In 2006 Madden and Heimans were named one of the "Top 10 People who are Changing the World of Politics and the Internet" by Politics Online and the World E-Government Forum.

David Madden is an American novelist, poet, author of literary criticism, and playwright.

Born in 1933 in Knoxville, Tennessee, Madden is a graduate of the University of Tennessee. Since the 1970's he has been a professor at Louisiana State University where he has served as writer in residence and director of the creative writng program. He is also the founder of the university's U.S. Civil War Center.

Madden's novels include "The Beautiful Greed" (1961), "Cassandra Singing" (1969), "Bijou" (1974), "The Suicide's Wife" (1978), "Pleasure Dome" (1979), "On the Big Wind" (1980) and "Sharpshooter: A Novel of the Civil War" (1996) as well as the short stories collections "The Shadow Knows" (1970) and "The New Orleans of Possibilities" (1982).

Madden has compiled and edited numerous collections of stories and is the author of academic volumes on James M. Cain, James Agee, and Carson McCullers. He is also the subject of the academic volume "David Madden: A Writer for All Genres" by Randy J. Hendricks and James A. Perkins (2006).