Question: What is the nickname of the head coach on whose team Bill Walton played in the early 1970s?

full_context: Document 1: List of UCLA Bruins men's basketball head coaches: The men's college basketball program of the University of California, Los Angeles (UCLA) was founded in 1920 and is known competitively as the UCLA Bruins. The team has had 13 head coaches in its history, and they have won 11 National Collegiate Athletic Association (NCAA) Men's Division I Basketball Championships, the most of any school. John Wooden won 10 national championships between 1964 and 1975, and Jim Harrick won the other in 1995. The "New York Times" wrote that Wooden "made UCLA. the most successful team in college basketball." After Wooden retired, the four coaches that succeeded him resigned, and the following three—Harrick included—were fired. The average tenure of those coaches after Wooden was four years. Ben Howland, led the Bruins to three consecutive Final Four appearances from 2006 to 2008.
Document 2: Jamaal Wilkes: Jamaal Abdul-Lateef (born Jackson Keith Wilkes on May 2, 1953), better known as Jamaal Wilkes, nicknamed "Silk", is an American retired basketball player who played the small forward position and won four NBA championships with the Golden State Warriors and Los Angeles Lakers. He was a three-time NBA All-Star and the 1975 NBA Rookie of the Year. In college, Wilkes was a key player on two NCAA championship teams under coach John Wooden for the UCLA Bruins. He was inducted into the Naismith Memorial Basketball Hall of Fame, and his jersey No. 52 was retired by both the Lakers and the Bruins.
Document 3: History of the Portland Trail Blazers: The following is a detailed history of the Portland Trail Blazers, a professional basketball team which joined the Western Conference of the National Basketball Association in 1970. They play at the Moda Center in the Lloyd District of Portland. They are owned by Microsoft co-founder and Vulcan Inc. chairman Paul Allen, who purchased the team in 1988. The team is often referred to as "Rip City", which was coined by play-by-play announcer Bill Schonely during their inaugural season. The Trail Blazers have retired several players jerseys, including Naismith Memorial Basketball Hall of Fame members Clyde Drexler and Bill Walton. Jack Ramsay, who was the Trail Blazers head coach from 1976 to 1986, had the number 77 retired in honor of Portland's only NBA Finals victory in 1977. Portland has had four NBA Rookies of the Year; Geoff Petrie (1971), Sidney Wicks (1972), Brandon Roy (2007) and Damian Lillard (2013). The only NBA Most Valuable Player that earned the award as a member of the Trail Blazers was Bill Walton in 1978.
Document 4: Larry Brown (basketball): Lawrence Harvey Brown (born September 14, 1940) is an American basketball coach, who was most recently head men's basketball coach at Southern Methodist University. He is the only coach in basketball history to win both an NCAA national championship (Kansas Jayhawks, 1988) and an NBA title (Detroit Pistons, 2004). He has a 1,275-965 lifetime professional coaching record in the American Basketball Association (ABA) and the National Basketball Association (NBA) and is the only coach in NBA history to lead eight different teams to the playoffs. He also won an ABA championship as a player with the Oakland Oaks in the 1968–69 season, and an Olympic Gold Medal in 1964. He is also the only person ever to coach two NBA franchises in the same season (Spurs and Clippers during the 1991–92 NBA season). Before coaching, Brown played collegiately at the University of North Carolina and professionally in the ABA. He has been a basketball coach since 1972.
Document 5: Pat Summitt: Patricia Sue Summitt (née Head ; June 14, 1952 – June 28, 2016) was an American women's college basketball head coach who, has accrued 1,098 career wins, the most in NCAA basketball history. She served as the head coach of the University of Tennessee Lady Vols basketball team from 1974 to 2012, before retiring at age 59 because of a diagnosis of early-onset Alzheimer's disease. She won eight NCAA championships (a NCAA women's record when she retired), a number surpassed only by the 10 titles won by UCLA men's coach John Wooden and the 11 titles won by UConn women's coach Geno Auriemma. She was the first NCAA coach, and one of four college coaches overall, with at least 1,000 wins.
Document 6: Luke Walton: Luke Theodore Walton (born March 28, 1980) is an American former professional basketball player and the current head coach of the Los Angeles Lakers. He played 10 seasons in the NBA as a forward, and won two NBA championships with the Lakers and won one with the Golden State Warriors as an assistant coach.
Document 7: Kareem Abdul-Jabbar: Kareem Abdul-Jabbar (born Ferdinand Lewis Alcindor Jr.; April 16, 1947) is an American retired professional basketball player who played 20 seasons in the National Basketball Association (NBA) for the Milwaukee Bucks and the Los Angeles Lakers. During his career as a center, Abdul-Jabbar was a record six-time NBA Most Valuable Player (MVP), a record 19-time NBA All-Star, a 15-time All-NBA selection, and an 11-time NBA All-Defensive Team member. A member of six NBA championship teams as a player and two as an assistant coach, Abdul-Jabbar twice was voted NBA Finals MVP. In 1996, he was honored as one of the 50 Greatest Players in NBA History. NBA coach Pat Riley and players Isiah Thomas and Julius Erving have called him the greatest basketball player of all time.
Document 8: Bill Bowerman: William Jay "Bill" Bowerman (February 19, 1911 – December 24, 1999) was an American track and field coach and co-founder of Nike, Inc. Over his career, he trained 31 Olympic athletes, 51 All-Americans, 12 American record-holders, 22 NCAA champions and 16 sub-4 minute milers. During his 24 years as coach at the University of Oregon, the Ducks track and field team had a winning season every season but one, attained 4 NCAA titles, and finished in the top 10 in the nation 16 times. As co-founder of Nike, he invented some of their top brands, including the "Cortez" and "Waffle Racer", and assisted in the company moving from being a distributor of other shoe brands to one creating their own shoes in house.
Document 9: UCLA Bruins men's basketball retired numbers: The men's college basketball program of the University of California, Los Angeles (UCLA) was founded in 1920 and is known competitively as the UCLA Bruins. The Bruins have won 11 National Collegiate Athletic Association (NCAA) Men's Division I Basketball Championships, the most of any school. UCLA players have been assigned jersey numbers ranging from 0 to 78 in the team's history. The school no longer issues 10 retired numbers in honor of former players. To qualify, a player must have been a three-time consensus All-American, a consensus national player of the year, or been inducted into the Naismith Memorial Basketball Hall of Fame. The retired numbers are displayed in the rafters of the Bruins' home arena, Pauley Pavilion. UCLA's legendary coach John Wooden generally opposed having numbers retired.
Document 10: Red Auerbach: Arnold Jacob "Red" Auerbach (September 20, 1917 – October 28, 2006) was an American basketball coach of the Washington Capitols, the Tri-Cities Blackhawks and the Boston Celtics. After he retired from coaching, he served as president and front office executive of the Celtics until his death. As a coach, he won 938 games (a record at his retirement) and nine National Basketball Association (NBA) championships in ten years (a number surpassed only by Phil Jackson, who won 11 in twenty years). As general manager and team president of the Celtics, he won an additional seven NBA titles, for a grand total of 16 in a span of 29 years, making him one of the most successful team officials in the history of North American professional sports.
Document 11: John Wooden: John Robert Wooden (October 14, 1910 – June 4, 2010) was an American basketball player and head coach at the University of California at Los Angeles. Nicknamed the "Wizard of Westwood," he won ten NCAA national championships in a 12-year period as head coach at UCLA, including a record seven in a row. No other team has won more than two in a row. Within this period, his teams won an NCAA men's basketball record 88 consecutive games. Wooden was named national coach of the year six times. He also won a Helms national championship at Purdue as a player 1931–1932 for a total of 11 national titles, a feat matched only by Geno Auriemma of NCAA women's basketball.
Document 12: John Salley: John Thomas Salley (born May 16, 1964) is an American retired professional basketball player, actor and talk show host. He was the first player in NBA history to play on three different championship-winning franchises, as well as the first player (and only one of two, the other being Tim Duncan) in the NBA to win a championship in three different decades.
Document 13: Bill Walton: William Theodore Walton III (born November 5, 1952) is an American retired basketball player and television sportscaster. Walton became known playing for John Wooden's powerhouse UCLA Bruins in the early 1970s, winning three successive College Player of the Year Awards, while leading the Bruins to two Division I national titles. He then went on to have a prominent career in the National Basketball Association (NBA) where he was a league Most Valuable Player (MVP) and won two NBA championships. His professional career was significantly hampered by multiple foot injuries. Walton was inducted into the Naismith Memorial Basketball Hall of Fame on May 10, 1993 and the Oregon Sports Hall of Fame that same year.
Document 14: UCLA Bruins men's basketball: The UCLA Bruins men's basketball program represents the University of California, Los Angeles (UCLA) in men's college basketball. Established in 1919, UCLA has won a record 11 NCAA Men's Division I Basketball Championships (tied with the UConn Huskies women's basketball team for most all-time among college basketball teams). UCLA teams coached by John Wooden won 10 national titles in 12 seasons, from 1964 to 1975, including seven straight from 1967 to 1973. UCLA went undefeated a record four times, in 1964, 1967, 1972, and 1973. Coach Jim Harrick led the team to another NCAA title in 1995. Former coach Ben Howland led UCLA to three consecutive Final Four appearances from 2006 to 2008. UCLA won 13 consecutive regular season conference titles between 1967 and 1979, an NCAA record they currently share with Kansas, whose streak is currently active. On March 30, 2013, Steve Alford was named the school's 13th head men's basketball coach.
Document 15: Jim Calhoun: James A. Calhoun (born May 10, 1942) is the former head coach of the University of Connecticut men's basketball team. His teams won three NCAA national championships (1999, 2004, 2011), played in four Final Fours (most recently in 2011), won the 1988 NIT title, and seven Big East tournament championships (1990, 1996, 1998, 1999, 2002, 2004, 2011). With his team's 2011 NCAA title win, the 68-year-old Calhoun became the oldest coach to win a Division I men's basketball title. He won his 800th game in 2009 and finished his career with 873 victories, ranking 12th all-time as of Feb. 2015. Calhoun is one of only six coaches in NCAA Division I history to win three or more championships and is widely considered one of the greatest coaches of all time. In 2005, he was inducted into the Basketball Hall of Fame.
ground_truth: Wizard of Westwood