Mike Treier is in his fifth season with the Giants and his second as the team's safeties coach. He works closely with Jerome Henderson in coaching the Giants' secondary.
In 2023, the safeties were one of the Giants' most productive position groups. Xavier McKinney played all 1,128 defensive snaps, finished second on the team with 116 tackles (78 solo), led team with three interceptions, and tied for the team high with 11 passes defensed. Jason Pinnock finished fourth on the team with 85 tackles (59 solo) and ranked second in the NFL with 123 interception return yards, including a 102-yard touchdown that tied a Giants record that has stood since 1961.
Treier spent the previous two seasons in the role of assistant defensive backs coach. In his debut season with the Giants in 2020, Treier was the team's defensive quality control coach, his first NFL position.
With significant contributions from the secondary, the Giants allowed 214.0 passing yards a game to finish 14th in the NFL in 2022, the team's highest ranking since it was 10th in 2013. The unit excelled despite multiple-game absences due to injury of cornerbacks Adoree' Jackson and Aaron Robinson and safety Xavier McKinney. Treier helped several newcomers become important contributors, including Pinnock and rookies Cor'Dale Flott and Dane Belton.
The defensive staff coached one of the NFL's most improved units in 2020. The defense ranked ninth in the league by allowing 357 points, 94 fewer than their total in 2019. The Giants were 12th in the league by allowing 349.3 yards-per-game after finishing 27th at 377.3 yards the previous season. Giants opponents averaged just 5.3 yards a play, the NFL's ninth-lowest figure.
Treier joined the Giants from Marshall University, where he coached from 2017-19 in his second stint with the school.
In 2019, Treier was the safeties coach and recruiting coordinator for a Thundering Herd team that finished 8-5, including 6-2 in Conference USA. In addition to his duties as safeties coach and recruiting coordinator, Treier was also heavily involved in Marshall's special teams, especially in the punt game where the Herd excelled during Treier's entire tenure.
Treier spent a second season as Marshall's cornerbacks coach in 2018, when the Herd was 9-4 overall and 6-2 in the conference and finished third in the league by allowing only 21.8 points a game. Marshall tied for fifth in the conference with 12 interceptions. Cornerback Chris Jackson was named second-team All-Conference USA and Steven Gilmore was selected to the league's all-freshman team.
Treier returned to Marshall as the cornerbacks coach in 2017. Jackson, then a sophomore, was chosen honorable mention all-conference after leading the team with three interceptions.
In 2016, Treier was named the secondary coach at UT-Martin. By the end of that season, he had been promoted to the SkyHawks' defensive coordinator position.
Treier first coached at Marshall in 2013-15, when he was a graduate assistant.
Treier was raised in Lancaster, Pa. and attend Penn Manor High School in Millersville, Pa. He has a bachelor's degree in business management from Temple University.
2011-2012 Temple University defensive student assistant
2013-15 Marshall University graduate assistant
2016 University of Tennessee at Martin secondary/co-defensive coordinator
2017-18 Marshall University cornerbacks/recruiting coordinator
2019 Marshall University safeties/recruiting coordinator
2020 New York Giants defensive quality control
2021-22 New York Giants assistant defensive backs
2023-24 New York Giants safeties
