CAA basketball agent Austin Brown and CAA executive Lisa Joseph-Metelus will represent Williamson, sources told ESPN.
Williamson, 19, has been pursued with great enthusiasm from potential endorsers, including shoe companies. Williamson is expected to command one of the largest rookie shoe deals in history.
The New Orleans Pelicans plan to choose Williamson with the first overall pick in next month's NBA draft.
Williamson, a 6-foot-7 forward, was the consensus NCAA player and freshman of the year.
Brown represents several top NBA players, including All-Star D'Angelo Russell of the Brooklyn Nets, Denver Nuggets guard Gary Harris, Memphis Grizzlies forward Jaren Jackson and Cleveland Cavaliers guard Collin Sexton. Brown has a law degree from Washington Lee University and played college basketball at DePauw University.
Joseph-Metelus worked closely with future Hall of Famer Dwyane Wade throughout his career, guiding much of his brand-building away from the floor.