The 7 ft 1 in (2.16 m), 275 pounds (125 kg) Clemson University graduate played center, and gained high esteem for his defense, particularly his rebounding and shot-blocking ability.

On February 21, 1979, while playing for the Atlanta Hawks, Rollins blocked a career high 12 shots in a 106–83 win over the Portland Trail Blazers.

[2] At the time of his retirement in 1995, he was fourth all-time in career blocked shots, behind only Hakeem Olajuwon, Kareem Abdul-Jabbar and Mark Eaton, with a total of 2,542.

He currently holds the ninth highest total of career blocked shots, having been passed on the list by Dikembe Mutombo, David Robinson, Patrick Ewing, Tim Duncan, and Shaquille O'Neal.

[3] On July 19, 2008, following lopsided losses to the New York Liberty and Detroit Shock, which put the Mystics at 8–14 on the season and 2.5 games out of playoff position, he was relieved of his duties.