Marquice Williams was named Atlanta Falcons special teams coordinator on Jan. 21, 2021.

Since joining the staff in 2021, he has helped kicker Younghoe Koo convert on 116-of-137 field goal attempts (84.7 percent), the sixth-best mark in the league in that span. Koo has also made eight game-winning field goals with time expiring, the most in the NFL in that span. Under Williams' guidance, special teamer KhaDarel Hodge was elected to the Pro Bowl in 2024 along with long snapper Josh Harris in 2021, marking the third special teams player to earn Pro Bowl honors along with Koo in 2020. Hodge is the first Falcon to earn Pro Bowl honors as a special teamer for the Falcons since Eric Weems in 2010.

In 2024 under Williams' guidance, Hodge recovered a muffed punt for a touchdown for the Falcons in the first quarter of the Week 4 win over the Saints. It was the first special teams touchdown since Week 11 of the 2022 season against the Chicago Bears, and the only touchdown scored by any punt protection unit in the league during the 2024 season. Hodge earned NFC Special Teams Player of the Week in Week 15 against the Las Vegas Raiders as he recorded his first blocked punt of his career while also tipping a punt, giving the Falcons good field position that led to a Falcons touchdown. Koo connected on 25-of-34 field goal attempts in addition to making a perfect 26-for-26 extra points for a total of 101 points in 2024. In the Week 4 win over the Saints, Koo was perfect on four field goal attempts, including a game-winning 58-yard field goal with :02 remaining in the game, the longest of his career and the then -longest field goal made in Mercedes-Benz Stadium. Defensive lineman Zach Harrison tipped a punt in the Week 6 game against the Carolina Panthers, which led to a Falcons touchdown before halftime. The Falcons stopped opponents on all three fake punts they faced in 2024 in Weeks 8, 9 and 13, the best of any team in the NFL. Since 2000, the Falcons joined the Chicago Bears as one of two teams to stop at least three fake punts in a season and the only team this century to face at least three punts in a season and not allow a conversion.

Punter Bradley Pinion finished the Week 15 game against the Raiders with four punts downed inside the 10-yard line and two inside the five. Finishing with eight total punts downed inside the 10, Pinion was one of three punters to have multiple punts downed inside the five in a single game and one of two players to have four downed inside the 10 in a single game in 2024.

Following the 2024 season, Williams was selected as the Head Coach for the East team of the 2025 East-West Shrine Bowl. Under Williams' leadership, the East team delivered a dominant performance to secure a 25-0 victory over the West. It was Williams' second appearance serving as a head coach for the Shrine Bowl, also serving as the Head Coach for the East Team in 2023.

In 2023, Williams helped Koo connect on 32-of-37 field goal attempts (86.5 percent) in addition to making 27-of-28 extra points for a total of 123 points scored, en route to earning two NFC Special Teams Player of the Week honors (Weeks 7 and 16). With 123 points scored on the season, Koo (591) passed Mick Luckhurst (558) for the third most points scored in franchise history. Under Williams' guidance, Pinion punted 75 times for 3,110 net punting yards, including a long of 66 yards. He notched 11 punts inside the 10-yard line, tied for fifth most in the league. Williams was also a participant in the Ozzie Newsome General Manager Forum and the Quarterback Coaching Summit in 2023. In June of 2024, Williams spoke as a panelist at the quarterback coaching summit that was held in Los Angeles, an event designed for the most promising front office personnel and coaches on the offensive side of the ball, representing the NFL's commitment to developing a diverse and inclusive workforce and providing opportunities for minority candidates. Additionally, Williams was a candidate in the 2024 Coach Accelerator program at the spring league meeting in Nashville, Tenn., which serves as a platform for clubs and owners to engage with qualified coaching candidates from diverse backgrounds. Candidates have the opportunity to build relationships with club owners and executives to further develop and hone their leadership skills.

In 2022, Atlanta was one of two teams to have special teams units score multiple touchdowns during the season – a Lorenzo Carter scoop-and-score off of a blocked punt in Week 2 and a Cordarrelle Patterson 103-yard kickoff return for a touchdown in Week 11. Under Williams' guidance, the Falcons blocked multiple punts (Troy Andersen – Week 2; Richie Grant – Week 17) for the first time in a season since at least 2000. Ade Ogundeji also recorded his second-career blocked field goal in two seasons with Williams, blocking a Justin Tucker field goal in Baltimore in Week 16.

As successful as the punt and field goal rush units were in 2022, Atlanta's returners had a special season as well. Patterson's 103-yard kickoff return for a touchdown was the ninth of his career, setting an NFL record for the most career kickoff return touchdowns in NFL history. Patterson would be named NFC Special Teams Player of the Week in Week 11. Additionally, Avery Williams returned 18 punts for 292 yards and led the NFL with 16.2 yards per punt return in 2022 (min. 15 att.).

Koo closed the 2022 season making 12-of-12 field goal attempts, including three from 50-plus, earning NFC Special Teams Player of the Month for December and January. In four seasons with Williams serving as special teams coordinator, Atlanta has had multiple NFC Special Teams Player of the Month honors.

In Williams' first season with Atlanta in 2021, Koo connected on 27-of-29 field goal attempts and all 30 of his PATs, and led the league with three game-winning field goals in the regular season. Punter Thomas Morstead punted 22 times for 1,015 yards (46.1 avg., 41.0 net avg.), including 11 inside the 20-yard line. Morstead earned NFC Special Teams Player of the Week in Week 12 at Jacksonville and NFC Special Teams Player of the Month for December. Harris recorded a career-high seven special teams tackles, earned second-team AP All-Pro honors and was selected to his first-career Pro Bowl. Under Marquice Williams' tutelage, Avery Williams returned 23 kickoffs for 490 yards (21.3 avg.), 20 punt returns for 153 yards (7.7 avg.) and totaled six special teams tackles, two forced fumbles and two fumble recoveries.

Williams joined the Falcons after spending two seasons (2019-20) with the Detroit Lions, where he served as an assistant special teams coach.

During that time, he helped Jamal Agnew total 1,237 yards on 45 kickoff returns – the fourth-most in the NFL – while averaging 27.5 yards per return and breaking a return 100 yards for a touchdown. Agnew tied for the league lead with two total return touchdowns in 2019. With Williams' assistance, Matt Prater converted 47-of-59 field goal attempts, including 10-of-13 from 50-plus yards with a long kick of 59 yards.

In 2020, under Williams' tutelage, Lions punter Jack Fox recorded the highest gross average (49.1) and net average (44.8) in a punter's first season in NFL history. Additionally, Fox's 44.8 net average was the third highest in a single season in league history. The rookie punter became the first Lions punter to be named to the Pro Bowl since 1988 and earned AP second-team All-Pro honors. 

Also in 2020, Matt Prater connected on his 59th-career made field goal of at least 50 yards, surpassing Sebastian Janikowski (58) for the most made field goals of 50-or-more yards in NFL history.

Prior to joining the Lions in 2019, he spent three seasons (2016-18) with the Los Angeles Chargers coaching staff. As a defensive assistant with the Chargers in 2018, Williams assisted the ninth-best defensive unit (333.7 yards per game) in the league and guided rookie safety Derwin James and veteran safety Adrian Phillips to their first-career Pro Bowl.

Williams began his coaching career in 2010 as the linebackers/assistant special teams coach at Winona State University before moving on to assistant coaching positions with Central Oklahoma (2011) and South Dakota (2012-15). In 2015, Williams participated in the NFL's Bill Walsh Minority Coaching Fellowship program with the Lions, where he served as a coaching intern for linebackers and special teams. Williams got his first opportunity with the Minority Coaching Fellowship with the Chicago Bears from 2013-14. He also served as the special teams coordinator for the East/West Shrine Game in 2017 and 2018.

A native of Fresno, Calif., Williams was a two-year starter at defensive back at Fresno City College before going on to start at the University of Mary (N.D.) from 2006-07. He and his wife, Elizabeth, have four children.