Question: Which one of the National Basketball Retired Players Association founders played for the Cincinnati Royals and Milwaukee Bucks?
Context: The 1972 NBA draft was the 26th annual draft of the National Basketball Association (NBA).  The draft was held on April 10 and 15, 1972 before the 1972–73 season.  In this draft, 17 NBA teams took turns selecting amateur U.S. college basketball players and other eligible players, including international players.  The first two picks in the draft belonged to the teams that finished last in each conference, with the order determined by a coin flip.  The Portland Trail Blazers won the coin flip and were awarded the first overall pick, while the Buffalo Braves were awarded the second pick.  The remaining first-round picks and the subsequent rounds were assigned to teams in reverse order of their win–loss record in the previous season.  As a result of last year's supplemental hardship draft, the Cincinnati Royals, the Atlanta Hawks, the Golden State Warriors and the Baltimore Bullets forfeited their first round picks, while the Los Angeles Lakers forfeited their fourth round pick.  Prior to the start of the season, the Cincinnati Royals relocated and became the Kansas City-Omaha Kings.  The draft consisted of 18 rounds comprising the selection of 198 players. Arnie Fielkow is currently the CEO and President of the Jewish Federation of Greater New Orleans.  Until June of 2017, he was the President and CEO of the National Basketball Retired Players Association (NBRPA).  Fielkow was formerly a Democratic politician in New Orleans.  In November 2006, he won a seat on the New Orleans City Council as a Member at-large, and served as City Council President.  He was reelected in 2010.  In the fall of 2011, he announced his resignation. George Patterson (November 26, 1939 – December 22, 2003) was an American basketball player who played in the National Basketball Association.  Patterson was originally drafted in the twelfth round of the 1961 NBA draft by the Cincinnati Royals.  He would finally play in the NBA with the Detroit Pistons from 1967 to 1968.  Later, he was selected by the Milwaukee Bucks in the 1968 NBA Expansion Draft. Ned R. Endress (March 2, 1918 – June 19, 2010) was an American professional basketball player.  He was a 6'2" (1.88 m) 200 lb (90 kg) forward-guard and played professionally for the Cleveland Rebels of the Basketball Association of America (BAA) in 1946–47, averaging 0.9 point and 0.3 assists per game.  Prior to that, Endress played college basketball at University of Akron.  He was a lifetime member of the National Basketball Retired Players Association. The 1957 NBA draft was the 11th annual draft of the National Basketball Association (NBA).  The draft was held on April 17, 1957, before the 1957–58 season.  In this draft, eight NBA teams took turns selecting amateur U.S. college basketball players.  Prior to the draft, the Fort Wayne Pistons and the Rochester Royals relocated to Detroit and Cincinnati, and became the Detroit Pistons and the Cincinnati Royals respectively.  In each round, the teams select in reverse order of their win–loss record in the previous season.  The draft consisted of 14 rounds comprising 83 players selected. Wayne Richard Embry (born March 26, 1937) is a retired American basketball player & basketball executive.  Embry's 11-year playing career as a center/forward spanned from 1958 to 1969 playing for the Cincinnati Royals, Boston Celtics and Milwaukee Bucks, all of the NBA.  After his playing career, Embry transitioned to a career as a professional basketball executive, becoming the first African-American general manager & team president in NBA history. Oscar Palmer Robertson (born November 24, 1938), nicknamed "The Big O", is an American former National Basketball Association player who played for the Cincinnati Royals and Milwaukee Bucks.  The 6 ft , 205 lb Robertson played point guard and was a 12-time All-Star, 11-time member of the All-NBA Team, and one-time winner of the MVP award in 14 professional seasons.  In 1962, he became the first of only two players in NBA history to average a triple-double for a season.  In the 1970–71 NBA season, he was a key player on the team that brought the Bucks their only NBA title.  His playing career, especially during high school and college, was plagued by racism. Zaid Abdul-Aziz (born Donald A. Smith on April 7, 1946) is a retired American professional basketball player.  Donald Smith changed his name to Zaid Abdul-Aziz in 1976 after he converted to Islam.  The 6'9" Abdul-Aziz starred at Iowa State University before being drafted by the NBA's Cincinnati Royals in 1968.  He played ten seasons in the league as a member of the Royals, Milwaukee Bucks, Seattle SuperSonics, Houston Rockets, Buffalo Braves, and Boston Celtics.  Nicknamed "The Kangaroo", he had his finest season in 1971–1972, when he averaged 13.8 points and 11.3 rebounds for Seattle.  He retired in 1978 with career totals of 4,557 points and 4,065 rebounds. The National Basketball Retired Players Association (NBRPA) is a non-profit association composed of former professional basketball players of the NBA, ABA, Harlem Globetrotters, and WNBA.  It was founded in 1992 by NBA Hall of Famers Dave DeBusschere, Dave Bing, Dave Cowens, Oscar Robertson and former NBA point guard Archie Clark.  Also referred to as the Legends of Basketball, the NBRPA serves as the official alumni organization for the NBA, ABA, Harlem Globetrotters, and WNBA. Bill Dinwiddie (born July 15, 1943) is a retired American basketball player who played in the National Basketball Association.  Dinwiddie signed as a free agent with the Cincinnati Royals in 1966 and began playing with the team in 1967.  In 1969, he was traded to the Boston Celtics for Bob Cousy.  He was later traded to the Milwaukee Bucks for a sixth-round draft pick.
Answer: Oscar Robertson