David Joseph Walsh (born on June 17, 1955) is an Irish sports journalist, who is chief sports writer of the British newspaper The Sunday Times. He is a four-time Irish Sportswriter of the Year and a three-time U.K. Sportswriter of the Year. Walsh has written books about American cyclist, Lance Armstrong. He led the way in exposing the doping within the cycling world. Walsh's books on Armstrong include From Lance to Landis: Inside the American Doping Controversy at the Tour de France. Walsh said in January 2013 in an interview with Global Cycling Network (GCN) that "cycling needs new leadership." Walsh's 2012 book entitled, Seven Deadly Sins: My Pursuit of Lance Armstrong, provides a definitive account of his 12-year quest to uncover the truth about Armstrong's cycling performance history.