Question: Who was the head coach during the 1999 season in which Ben Wallace was traded from the Washington Wizards?

The 1998–99 NBA season was the Wizards' 38th season in the National Basketball Association.  Prior to the start of the season, which was delayed by a four-month lockout, the Wizards acquired All-Star guard Mitch Richmond and Otis Thorpe from the Sacramento Kings.  Richmond had a solid season leading the team in scoring averaging 19.7 points per game.  Meanwhile, Rod Strickland finished second in the league with 9.9 assists per game.  However, the Wizards continued to under achieve as head coach Bernie Bickerstaff was fired after a 13–19 start, and was replaced with Jim Brovelli midway through the season.  The team lost seven of their final nine games finishing sixth in the Atlantic Division with a disappointing 18–32 record.  Following the season, Thorpe signed as a free agent with the Miami Heat, Calbert Cheaney signed with the Boston Celtics, Ben Wallace was traded to the Orlando Magic, and Brovelli was fired as coach. <SEP> The 1999–2000 NBA season was the 11th season for the Orlando Magic in the National Basketball Association.  During the offseason, the Magic hired Doc Rivers as Head Coach while acquiring Tariq Abdul-Wahad from the Sacramento Kings, Chris Gatling from the Milwaukee Bucks, Ben Wallace from the Washington Wizards, second-year forward Pat Garrity from the Phoenix Suns, and rookie Corey Maggette from the Seattle SuperSonics, while signing free agents John Amaechi and Monty Williams.  The Magic's transition continued at midseason, trading Abdul-Wahad and Gatling to the Denver Nuggets for Ron Mercer, Chauncey Billups and Johnny Taylor.  However, Billups never played for the Magic due to a shoulder injury he sustained in Denver. <SEP>  A native of Alabama, Wallace attended Cuyahoga Community College and Virginia Union University and signed with the Washington Bullets (later Wizards) as an undrafted free agent in 1996. Ben Camey Wallace (born September 10, 1974) is an American retired professional basketball player.  In his NBA career, Wallace played with the Washington Bullets/Wizards, Orlando Magic, Detroit Pistons, Chicago Bulls and Cleveland Cavaliers. <SEP> The 2003–04 NBA season was the 63rd season for the Pistons, the 56th in the National Basketball Association, and the 47th in the Detroit area.  Despite a solid year last season, the Pistons received the second overall pick in the 2003 NBA draft, which they obtained from the Memphis Grizzlies.  They selected Darko Miličić as their top pick, but only used him as a reserve as he played limited minutes off the bench.  After their first trip to the Conference Finals since 1991, the Pistons hired Larry Brown as head coach.  Under Brown, the Pistons were once again a tough defensive team as they went on a 13-game winning streak between December and January.  However, after a solid 33–16 start, they struggled in February losing six straight games.  At midseason, the team acquired All-Star forward Rasheed Wallace from the Atlanta Hawks after playing just one game for them.  With the addition of Wallace, the Pistons won 16 of their final 19 games finishing second in the Central Division with a 54–28 record.  Ben Wallace was selected for the 2004 NBA All-Star Game.