Sinjin is regarded as one of the Greatest Players in Beach Volleyball History and noted for being the original "King of the Beach." His accomplishments in the sport are unparalleled and his contributions to the development of beach volleyball have helped to put the sport on the map.
Together with longtime partner, Randy Stoklos, Sinjin became the first player to reach 100 career open victories, and still remains atop the leader board to this day with 146 recorded victories. Sinjin claimed 11 International and World Championships in his 23-year career, more than any other player. In 1996, Sinjin and then partner, Carl Henkel, became the first American team to qualify for the debut of beach volleyball as a full medal sport at the 1996 Atlanta Olympics.
He was inducted to the UCLA Sports Hall of Fame in 1991 as the first volleyball player to receive the prestigious honor. While at UCLA he earned All-American honors en route to a 4-year stint with the U.S. National Team (indoor). He is a USVBA All-American and member of the Board of Directors of USA Volleyball as an athlete representative. He has served in the past as President of the Association of Volleyball Professionals, and currently serves as the President of the FIVB's Beach Volleyball World Council presiding over the sport in over 219 member countries. He is also a member of the Board of Directors of the Big Brothers, Big Sisters organization and the United States Youth Volleyball League (USYVL). A native of Pacific Palisades, Calif., Sinjin learned the game at legendary Sorrento Beach with the pioneers of the sport like, Ron Von Hagen, Gene Selznick. Sinjin is a longtime resident of Pacific Palisades where he lives with his wife, Patty, and the couple's three children, Hagen, Stanton and Sinjin, Jr.