Question: Who was the head coach during the 1999 season in which Ben Wallace was traded from the Washington Wizards?
Sentence (from "1999–2000 Orlando Magic season"): 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.
Relevant evidence: Yes