Question: The 1974–75 Seattle SuperSonics season included which former Boston Celtics center as head coach?

 Russell played center for the Boston Celtics of the National Basketball Association (NBA) from 1956 to 1969.  A five-time NBA Most Valuable Player and a twelve-time All-Star, he was the centerpiece of the Celtics dynasty, winning eleven NBA championships during his thirteen-year career.  Russell holds the record for the most championships won by an athlete in a North American sports league (tied with Henri Richard of the National Hockey League).  Before his professional career, Russell led the University of San Francisco to two consecutive NCAA championships (1955, 1956), and he captained the gold-medal winning U.S. national basketball team at the 1956 Summer Olympics. William Felton Russell (born February 12, 1934) is an American retired professional basketball player. <SEP> The 1988–89 Boston Celtics season was the 43rd season of the Boston Celtics in the National Basketball Association (NBA).  This was the first season for Jim Rodgers as head coach.  Rodgers had been a Celtics assistant coach prior to this season.  This year's Celtics team was severely hindered by the loss of star forward Larry Bird to a heel injury which required surgery.  Bird played only six early-season games before being lost to injury.  Initially, Bird was expected back in March, but it was delayed and ultimately became a season-ending injury.  The results were dramatic as the Celtics, who had averaged over 60 wins per season thus far in the 1980s, fell to just 42 wins in this season.  Coming into the season, the Celtics had been the Eastern Conference's #1 seed five years in a row.  This season they were the #8 seed, clinching a playoff spot in the season's final game.  This season included some bright spots, particularly the emergence of guard Reggie Lewis, who had been only a minimal bench contributor in his rookie season of 1987-88, but averaged nearly 20 points per game as a starter in 1988-89. <SEP> The 1973–74 Seattle SuperSonics season was the 7th season of the Seattle SuperSonics in the National Basketball Association (NBA).  Following the resignation of Lenny Wilkens as a head coach after the 1971–72 season and a poor campaign in the 1972–73 season that saw the departure of general manager Bob Houbregs, the Sonics hired Boston Celtics' stalwart Bill Russell as head coach and general manager.  With Russell at the helm, the team finished in 6th place in the Western Conference with a 36–46 record.  The Sonics' home court, Seattle Center Coliseum, was the venue for the 1974 NBA All-Star Game. <SEP>  In their second season with Bill Russell as head coach and with rookies comprising half the roster, the SuperSonics finished the regular season in 4th place in the Western Conference with a 43–39 record and reached the playoffs for the first time in franchise history. The 1974–75 Seattle SuperSonics season was the 8th season of the Seattle SuperSonics in the National Basketball Association (NBA).  After defeating the Detroit Pistons in 3 games in the first round in a best-of-three series, the team fell to the future champions Golden State Warriors in six games.