Hawks to retire Dikembe Mutombo's No. 55 By foxsports Updated Mar. 4, 2020 11:51 p.m. ET Atlanta Hawks CEO Steve Koonin and coach Mike Budenholzer announced on Tuesday that the organization will retire Dikembe Mutombo's No. 55 uniform in a special ceremony on Nov. 24 when the Hawks host the Boston Celtics at Philips Arena.