Oklahoma State University Athletics
Cassity Named Oklahoma State Defensive Coordinator
December 12, 2025 | Cowboy Football
STILLWATER – Oklahoma State football coach Eric Morris named the first member of his coaching staff Friday, adding Skyler Cassity as defensive coordinator.
Cassity worked in the same role under Morris at North Texas and will join the Cowboys following UNT's appearance in the Isleta New Mexico Bowl.
He brings four years of experience as an NCAA Division I defensive coordinator, serving in that role for Abilene Christian from 2022-23, Sam Houston in 2024 and North Texas in 2025.
In his first year at UNT, Cassity helped improve the Mean Green by nearly 10 points per game in scoring defense, by 90 yards per game in total defense and by more than 100 yards per game in passing defense.
Entering bowl season, his UNT defense ranks among the top 25 in the FBS in fumbles recovered (No. 3), turnovers gained (No. 6), passing yards allowed (No. 10), passes intercepted (No. 20) and passing efficiency defense (No. 21).
A 2016 Auburn graduate, Cassity has deep ties to Oklahoma State. His brother, Braden Cassity, played football at OSU from 2018-23; his father, Mike Cassity, served as co-defensive coordinator at OSU during a long college coaching career; and his mother, Colleen Hartman Rambusch, worked for OSU athletics in radio and TV during the Bob Simmons and Eddie Sutton eras.
All university hires are pending completion of a background check.
Skyler Cassity Coaching History
2014-16: Auburn, student assistant
2016: Texas State, graduate assistant
2017-19: Texas Tech, graduate assistant
2020-21: Missouri State, linebackers/nickels/safeties
2022-23: Abilene Christian, defensive coordinator
2024: Sam Houston, defensive coordinator
2025: North Texas, defensive coordinator
2026: Oklahoma State, defensive coordinator
Cassity worked in the same role under Morris at North Texas and will join the Cowboys following UNT's appearance in the Isleta New Mexico Bowl.
He brings four years of experience as an NCAA Division I defensive coordinator, serving in that role for Abilene Christian from 2022-23, Sam Houston in 2024 and North Texas in 2025.
In his first year at UNT, Cassity helped improve the Mean Green by nearly 10 points per game in scoring defense, by 90 yards per game in total defense and by more than 100 yards per game in passing defense.
Entering bowl season, his UNT defense ranks among the top 25 in the FBS in fumbles recovered (No. 3), turnovers gained (No. 6), passing yards allowed (No. 10), passes intercepted (No. 20) and passing efficiency defense (No. 21).
A 2016 Auburn graduate, Cassity has deep ties to Oklahoma State. His brother, Braden Cassity, played football at OSU from 2018-23; his father, Mike Cassity, served as co-defensive coordinator at OSU during a long college coaching career; and his mother, Colleen Hartman Rambusch, worked for OSU athletics in radio and TV during the Bob Simmons and Eddie Sutton eras.
All university hires are pending completion of a background check.
Skyler Cassity Coaching History
2014-16: Auburn, student assistant
2016: Texas State, graduate assistant
2017-19: Texas Tech, graduate assistant
2020-21: Missouri State, linebackers/nickels/safeties
2022-23: Abilene Christian, defensive coordinator
2024: Sam Houston, defensive coordinator
2025: North Texas, defensive coordinator
2026: Oklahoma State, defensive coordinator
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