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

<P0-S0> The 1998–99 NBA season was the Wizards' 38th season in the National Basketball Association. <P0-S1>  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. <P0-S2>  Richmond had a solid season leading the team in scoring averaging 19.7 points per game. <P0-S3>  Meanwhile, Rod Strickland finished second in the league with 9.9 assists per game. <P0-S4>  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. <P0-S5>  The team lost seven of their final nine games finishing sixth in the Atlantic Division with a disappointing 18–32 record. <P0-S6>  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> <P1-S0> The 1999–2000 NBA season was the 11th season for the Orlando Magic in the National Basketball Association. <P1-S1>  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. <P1-S2>  The Magic's transition continued at midseason, trading Abdul-Wahad and Gatling to the Denver Nuggets for Ron Mercer, Chauncey Billups and Johnny Taylor. <P1-S3>  However, Billups never played for the Magic due to a shoulder injury he sustained in Denver. <SEP> <P2-S0> Ben Camey Wallace (born September 10, 1974) is an American retired professional basketball player. <P2-S1>  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. <P2-S2>  In his NBA career, Wallace played with the Washington Bullets/Wizards, Orlando Magic, Detroit Pistons, Chicago Bulls and Cleveland Cavaliers. <SEP> <P3-S0> 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. <P3-S1>  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. <P3-S2>  They selected Darko Miličić as their top pick, but only used him as a reserve as he played limited minutes off the bench. <P3-S3>  After their first trip to the Conference Finals since 1991, the Pistons hired Larry Brown as head coach. <P3-S4>  Under Brown, the Pistons were once again a tough defensive team as they went on a 13-game winning streak between December and January. <P3-S5>  However, after a solid 33–16 start, they struggled in February losing six straight games. <P3-S6>  At midseason, the team acquired All-Star forward Rasheed Wallace from the Atlanta Hawks after playing just one game for them. <P3-S7>  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. <P3-S8>  Ben Wallace was selected for the 2004 NBA All-Star Game.