Josh Smith ranks second all-time in franchise history with 1,440 career blocks.

The Atlanta Hawks enlisted some talented rim protectors throughout their 77 years in the NBA. Let’s take a look at some of the greatest shot-blockers in franchise history, from Tree Rollins and Dikembe Mutombo to Josh Smith.

1. Tree Rollins – 2,283 blocks

The Hawks made Rollins the 14th overall pick in the 1977 NBA Draft after four years at Clemson. Tree, whose real name was Wayne Monte Rollins, spent the first 11 of his 18 professional seasons with Atlanta, from 1977-78 to 1987-88. The seven-footer appeared in 814 games (478 starts) and averaged 7.0 points, 7.4 rebounds and 2.8 blocks in 25.5 minutes a night. He suited up for at least 70 contests in all but one of those campaigns, something he was unable to accomplish once in the seven years following his time with the Hawks. Rollins’ two most productive seasons came in 1982-83 and 1983-84, when the big man played in 157 of a possible 164 games (156 starts). He tallied 7.8 ppg, 9.3 rpg, 0.9 apg, and led the league in blocks with a career-best 4.3 bpg in 1983, helping him finish second for the Defensive Player of the Year award while making his first All-Defensive Team (Second). Rollins followed that up by posting 8.6 ppg, 7.7 rpg and 3.6 bpg in 1984, finishing 12th for DPOY and securing his lone All-Defensive First Team honor.

Only Hall of Famer Dominique Wilkins (882) has played more games for the Hawks than Rollins’ 814. Rollins is tenth in NBA history with 2,542 career blocks.

2. Josh Smith – 1,440 blocks

Much like the man he was chasing on this list, Smith enjoyed the best seasons of his 13-year NBA career in Atlanta. After the Hawks chose him with the 17th pick in the 2004 draft straight out of high school, ‘J-Smoove’ spent the first nine years of his career there, from 2004-05 to 2012-13. During that stretch, he averaged 15.3 ppg, 8.0 rpg, 3.2 apg, 1.3 spg and 2.1 bpg across 676 contests (654 starts). Smith swatted at least 1.6 shots per game in every campaign with Atlanta and registered a career-high 2.9 bpg in 2006-07. He earned Defensive Player of the Year votes from 2006-07 to 2011-12, finishing as high as second in 2009-10 behind Dwight Howard. That year, Smith averaged 15.7 ppg, 8.7 rpg, career-bests in assists (4.2) and steals (1.6) and 2.1 bpg in 81 appearances while garnering his only All-Defensive selection (Second Team).

3. Dikembe Mutombo – 1,094 blocks

It only took Mutombo four-and-a-half seasons in Atlanta to claim the third spot on their all-time list. ‘Deke’ was the fourth overall pick by the Denver Nuggets in the 1991 NBA Draft, where the Hall of Famer spent the first five years of his 18-year career. He led the league in blocks over his final three seasons in Denver, but the Democratic Republic of the Congo native chose to sign with the Hawks in free agency ahead of the 1996-97 campaign. Mutombo continued his reign as one of the best defenders in the game, as he led the association in rebounds twice and won three of his four DPOY awards between 1996-97 and 2000-01 with Atlanta before being traded to Philadelphia at the deadline in 2001.

Across 343 outings with Atlanta, Mutombo compiled averages of 11.9 points, 12.6 rebounds, 1.2 assists and 3.2 blocks in 36.2 minutes. He suited up for all but seven games during his tenure with the Hawks, a remarkable feat considering he only missed a total of 19 throughout his time as a Nugget. Mutombo was an eight-time All-Star, three-time All-NBA, and six-time All-Defensive selection, and he’s one of just three players in the league’s history with four DPOY trophies. He ranks second on the all-time blocks leaderboard with 3,289, sitting behind the great Hakeem Olajuwon (3,830).

4. Jon Koncak – 747 blocks

Atlanta selected Koncak with the fifth overall pick in the 1985 NBA Draft. The seven-footer out of SMU spent 10 of his 11 professional seasons with the Hawks from 1985-86 to 1994-95. Koncak was primarily deployed off the bench, starting just 344 of his 717 appearances for the franchise. He collected averages of 4.6 ppg, 5.0 rpg, 1.0 apg and 1.0 bpg in 21.1 minutes per game. During the 1993-94 season, Koncak played in all 82 games and started 78, finishing the year with 4.2 ppg, 4.5 rpg, 1.2 apg, 0.8 spg and a career-best 1.5 bpg.

5. Dan Roundfield – 716 blocks

Roundfield started his pro career with the Indiana Pacers of the ABA in 1975-76 after being selected in the second round of the 1975 NBA Draft by the Cleveland Cavaliers. He joined the NBA the following year with Indiana, but his career took off when he signed as a veteran free agent with Atlanta before the 1978-79 season. Roundfield suited up for the Hawks for six productive years, from 1978-79 to 1983-84, when he averaged 17.6 points, 10.7 rebounds, 2.4 assists, 1.0 steals and 1.6 blocks across 435 outings. During this stretch, he earned three consecutive All-Star nods (1980-1982), five All-Defensive honors, finished as high as fifth in MVP voting and made his lone All-NBA appearance (Second Team) in 1980.