Question: The head coach who started the 1999-2000 Phoenix Suns season is currently general manager for what NBA team?  
Context: The 1980–81 Phoenix Suns season was the 13th season for the Phoenix Suns of the National Basketball Association.  At 57–25, the team had finished with its best regular season record.  For the Suns, they had appeared in their first Finals five years ago but never could claim a divisional title as their own.  Atop the Western Conference standings for the first time, the Suns had earned a bye in the first round of the playoffs.  The offense was highlighted by balanced attack, with four starters averaging 15 points or more a game, but none greater than 19.  This, despite a trade that meant the departure of four-time All-NBA Paul Westphal, who was swapped for fourth-year All-Star guard Dennis Johnson.  In the conference semifinals, the Suns would meet the Kansas City Kings, a team they had defeated in the first round one season ago but found more difficult to handle this season.  After a 22-point win in game one, the Suns would go on to lose game seven and the series.  The Suns were led by head coach John MacLeod and played all home games in Arizona Veterans Memorial Coliseum. The 1983–84 Phoenix Suns season was the 16th season for the Phoenix Suns of the National Basketball Association.  The Suns were in the playoffs for the seventh consecutive season, extending a then-franchise record.  The Suns eliminated their first round opponent, Portland, three games to two before defeating the Utah Jazz and NBA leading scorer, Adrian Dantley, four games to two.  In the Western Conference Finals, the Suns lost to the Los Angeles Lakers in six games.  The team was led by head coach John MacLeod, in his 11th year with the Suns, and played all home games in Arizona Veterans Memorial Coliseum. Daniel Ray Ainge (born March 17, 1959) is an American basketball executive and former professional basketball and baseball player.  Ainge is currently the general manager and President of Basketball Operations for the Boston Celtics of the National Basketball Association (NBA). The 2015–16 Philadelphia 76ers season was the 77th season of the franchise in the National Basketball Association (NBA).  It was also the second straight season that Joel Embiid, their third pick in the 2014 NBA draft, would not suit up for the 76ers due to a leg injury.  Philadelphia broke the record for the longest losing streak in American professional sports history with 27 straight losses over this season and last season with a 114–116 loss to the Houston Rockets.  The losing streak would reach to 28 games (with the 18 straight losses tying the record for longest opening season losing streak with the 2009–10 New Jersey Nets) before getting their first victory at home against the Los Angeles Lakers, which was also Kobe Bryant's last game against the 76ers in Philadelphia.  Philadelphia would also hire former Phoenix Suns owner, coach, general manager, and four-time NBA Executive of the Year winner Jerry Colangelo on December 7, 2015 as their Chairman of Basketball Operations.  Eleven days later, former Denver Nuggets, Phoenix Suns, New York Knicks, and Los Angeles Lakers head coach Mike D'Antoni would join the team as an associate head coach.  Near the end of the season, general manager Sam Hinkie would announce his resignation from his position, being replaced by Jerry's son Bryan Colangelo before the end of the season.  Jerry would also announce his personal demotion from his original position afterwards.  They finished just one game shy of tying the NBA record for most losses in a season set by themselves during their 1972–73 season when they went 9–73.  However, it would be the season where Sam Hinkie's goal of "The Process" came into full fruition since they'd later earn the #1 selection in the 2016 NBA draft. The 1986–87 Phoenix Suns season was the 18th season for the Phoenix Suns of the National Basketball Association.  The Suns started their 14th season under head coach John MacLeod, going 22–34.  Suns management decided to replace the longstanding MacLeod with Dick Van Arsdale, a former Suns player from the Finals team coached then by MacLeod.  With Van Arsdale, the Suns would finish the season going 14–12 in their last 26 games of the regular season.  All Suns home games were played at Arizona Veterans Memorial Coliseum. The 1975–76 Phoenix Suns season was the eighth season for the Phoenix Suns of the National Basketball Association.  The season included an improbable run to the NBA Finals by a team that had never won a playoff series and made the playoffs only one other season in the franchise's existence.  With a regular season record of 42–40, the Suns had finished third in the Pacific division standings and improved upon last season's win total by 10 games.  The ensuing playoff run took plenty by surprise, including a seven-game series win against the Western Conference's top seed Golden State Warriors, a team that had finished 17 games ahead of the Suns in the divisional standings.  The franchise's first Finals appearance pitted them against a 12-time champion in the Boston Celtics, whose roster featured three players from that season's All-Star Game.  The 1976 NBA Finals would feature a memorable Game 5 triple-overtime thriller filled with controversies in which the Suns narrowly lost.  Returning home for Game 6, the demoralized Suns would lose Game 6 and the series but not before endearing a generation of fans to the Suns franchise and showcasing a basketball from the desert southwest.  The team's "Cinderella" season earned them the nickname Sunderella Suns.  John MacLeod was head coach and the Suns played their home games at Arizona Veterans Memorial Coliseum. The 1999–2000 NBA season was the 32nd season for the National Basketball Association's Phoenix Suns.  During the offseason, the Suns acquired All-Star guard Anfernee Hardaway from the Orlando Magic, and signed free agent Rodney Rogers while re-signing former Suns center Oliver Miller.  Scott Skiles would come on as head coach, replacing Danny Ainge after a 13–7 start to the season.  The Suns would finish third in the Pacific Division at 53–29, and extend the franchise's record for playoff appearances before losing in the Western Conference semifinals. The 1969–70 Phoenix Suns season was the second season of the Phoenix Suns in the National Basketball Association (NBA).  It was the first season, however, for eventual Hall of Famer Connie Hawkins, who was a star in the ABA before switching to the NBA to join the Suns.  Head coach Johnny "Red" Kerr was replaced by general manager Jerry Colangelo after the Suns started 15–23.  All home games were played at Arizona Veterans Memorial Coliseum. The 1970–71 Phoenix Suns season was the third season for the Phoenix Suns of the National Basketball Association.  Head coach Cotton Fitzsimmons lead the Suns, in the NBA's first season which separated the teams into both conferences and divisions as the league continued to gain more teams.  It was the first season the Suns would be without the services of All-Star guard Gail Goodrich.  With a 48–34 record (fourth best in the league), the Suns set the NBA record for the team with the best winning percentage not to make the playoffs.  The team would break their own record the next year with a 49–33 finish.  All home games were played at Arizona Veterans Memorial Coliseum. The 2008–09 Phoenix Suns season was the 41st season of the franchise in the National Basketball Association (NBA).  The season was to be a promising one, filled with All-Star talent at several positions.  It was believed over the offseason, the Suns would be able to better incorporate Shaquille O'Neal, who necessitated changes to both the offense and defense after being obtained in a trade one season ago.  It was also the first season head coach Terry Porter had been able to use the summer to implement his defensive approach for a team which had in seasons past scored a large number of their points off fast breaks and early in the shot clock.  Sensing a need for change, team management traded for scorer Jason Richardson in December, but this did not appear to immediately reinvigorate an offense that had recently led the league in points per game.  However, after Phoenix went 28–23 to start the season, Suns assistant Alvin Gentry was named to replace Porter as head coach.  Less than one week after the All-Star Game, Amar'e Stoudemire sustained a season-ending eye injury while the improvement of the team never fully came.  The Suns finished 46–36, second in the Pacific division but out the playoffs for the first time since Steve Nash rejoined the Suns in the 2004–05 season.
Answer: Boston Celtics