STILLWATER — On Thursday morning, Oklahoma State defensive coordinator Derek Mason announced he was stepping away from the Cowboys program.
In a message posted on Twitter, Mason said, “After 30 consecutive seasons in the great game of football, I have decided to take a sabbatical from coaching in college at the conclusion of my current contract.” He signed a one-year, $1.1 million contract late in 2022, and it is set to expire on Jan. 31.
“I look forward to spending time with my family to rest and reflect on opportunities within the game I love.”
Mason was hired by the Cowboys on Jan. 26, 2022, replacing defensive coordinator Jim Knowles who left for Ohio State a month earlier. Mason arrived in Stillwater after spending a season as the defensive coordinator for Auburn. Before that, Mason coached at Vanderbilt for seven years, amassing a 27-55 record.
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“I have been blessed during my tenure at Oklahoma State to work alongside Coach (Mike) Gundy,” Mason continued. “His leadership and consistency are unmatched in the profession.”
In a separate statement released by coach Mike Gundy on Thursday morning, he thanked Mason for his time in Stillwater.
“Oklahoma State Football and I appreciate what Derek Mason and his family have brought to our team/culture,” he wrote. “The positive effect he’s had on our players, staff and program have been awesome.
“I know it was a tough decision, but life is bigger than football. We wish him and his family nothing but the very best and they are always welcome back in Stillwater.”
OSU athletic director Chad Weiberg also shared a message through Twitter, expressing gratitude to the 53-year-old coach, “Thank you, Coach Mason, for all you did for Cowboy Football and our student-athletes during your time here. Wish you nothing but the very best to you and your family.”
What it means for OSU
It was always going to be a tough task for Mason to follow up Knowles’ 2021 performance.
Mason arrived in Stillwater months after Knowles’ was named a Broyles Award finalist, and his defense was nationally recognized in 2021. The unit finished the season eighth in the country in points allowed (16.8), sixth in first downs allowed (15.8) and first in the Big 12 with 57 sacks.
The team ranked third in the country in yards allowed per game, trailing only Wisconsin and Georgia.
Mason was also going to be without the majority of the cornerstones from the ’21 group.
Starting linebackers Malcolm Rodriguez and Devin Harper exhausted their eligibility, and both were selected in the 2022 NFL Draft. The secondary was gutted with players leaving for the draft and entering the transfer portal.
Safety Jason Taylor II was the only starter to return for this season.
In 13 games under Mason, the Cowboys finished fourth in interceptions (13) in the conference, sixth in sacks (27) and eighth in red zone defense.
After finishing third in yards allowed a season earlier, the Cowboys finished 2022 ranked 115th out of 131 in the category with 435.7 yards allowed per game.
Now, the Cowboys will now be searching for their third defensive coordinator in as many seasons.
Mason’s tenure with the Cowboys is the shortest of any defensive coordinator under Gundy, followed by Vance Bedford and Tim Beckman (two seasons).
The next hire will be the seventh defensive coordinator in the Gundy era, with no defensive coordinator having lasted more than five seasons in the program.
March 22, 2022 video. The Cowboys DC previously held the same position at Auburn. Video courtesy/OSU Athletics
Photos: Derek Mason's career so far
Derek Mason

Derek Mason watches drills in Oklahoma State's first open practice of the spring on March 22, 2022 at the Sherman E. Smith practice center in Stillwater, Oklahoma. (DEVIN LAWRENCE WILBER/for the Tulsa World)
Derek Mason

Derek Mason is seen on the sidelines during an Oct. 31, 2020 game against Mississippi in Nashville, Tenn. Mason was fired during the 2020 season, and spent last season as defensive coordinator at Auburn before accepting the same position at Oklahoma State.
Derek Mason

Vanderbilt head coach Derek Mason speaks with an official during the second half of an NCAA college football game against Kentucky, Saturday, Nov. 14, 2020, in Lexington, Ky. (AP Photo/Bryan Woolston)
Derek Mason

Vanderbilt head coach Derek Mason talks with cornerback Randall Haynie (4) in the first half of an NCAA college football game against LSU Saturday, Oct. 3, 2020, in Nashville, Tenn. (AP Photo/Mark Humphrey)
Derek Mason

Vanderbilt head coach Derek Mason pauses by a tribute to Osia Lewis, a defensive assistant for the Vanderbilt football team and longtime collegiate coach, before the start of an NCAA college football game between Vanderbilt and LSU Saturday, Oct. 3, 2020, in Nashville, Tenn. Lewis died in May after a lengthy battle with liver cancer. He was 57.(AP Photo/Mark Humphrey)
Derek Mason

Vanderbilt head coach Derek Mason walks on the sideline in the first half of an NCAA college football game against LSU Saturday, Oct. 3, 2020, in Nashville, Tenn. (AP Photo/Mark Humphrey)
Derek Mason

Vanderbilt head coach Derek Mason has words with an official during the first half of an NCAA college football game against Florida, Saturday, Nov. 9, 2019, in Gainesville, Fla. (AP Photo/John Raoux)
Derek Mason

Then-Vanderbilt head coach Derek Mason arrives at Williams Brice Stadium in Columbia, S.C. before a Nov. 2, 2019 game against South Carolina.
Derek Mason

Vanderbilt head coach Derek Mason celebrates after Vanderbilt upset Missouri in an NCAA college football game Saturday, Oct. 19, 2019, in Nashville, Tenn. Vanderbilt won 21-14. (AP Photo/Mark Humphrey)
Derek Mason

Vanderbilt head coach Derek Mason reacts after being doused after his team defeated Tennessee in an NCAA college football game Saturday, Nov. 24, 2018, in Nashville, Tenn. (AP Photo/Mark Humphrey)
Derek Mason

Then-Vanderbilt head coach Derek Mason (right) watches from the sideline during a Sept. 22, 2018 game against South Carolina. Mason is the new defensive coordinator at Oklahoma State.
Derek Mason

Then-Vanderbilt head coach Derek Mason celebrates with his team after a November 2017 win at Tennessee. Mason was recently named defensive coordinator at Oklahoma State.
Derek Mason

Vanderbilt head coach Derek Mason, center, celebrates with players after the team's win against Kansas State in an NCAA college football game Saturday, Sept. 16, 2017, in Nashville, Tenn. Vanderbilt Won 14-7. (AP Photo/Mark Zaleski)
Derek Mason

Vanderbilt head coach Derek Mason is dunked by defensive tackle Nifae Lealao (77) after Vanderbilt upset Tennessee 45-34 in an NCAA college football game Saturday, Nov. 26, 2016, in Nashville, Tenn. (AP Photo/Mark Humphrey)
Derek Mason

Vanderbilt head coach Derek Mason gets dunked by his payers after defeating Georgia 17-16 in an NCAA college football game Saturday, Oct. 15, 2016, in Athens, Ga. (AP Photo/John Bazemore)
Derek Mason

Vanderbilt head coach Derek Mason, left, meets with Kentucky head coach Mark Stoops after an NCAA college football game Saturday, Nov. 14, 2015, in Nashville, Tenn. Vanderbilt won 21-17. (AP Photo/Mark Humphrey)
Derek Mason

Vanderbilt head coach Derek Mason is pulled back to the sideline as he protests a call in the second half of an NCAA college football game against Missouri Saturday, Oct. 24, 2015, in Nashville, Tenn. Vanderbilt won 10-3. (AP Photo/Mark Humphrey)
Derek Mason

Vanderbilt head football coach Derek Mason directs players during an NCAA college football practice Thursday, Aug. 6, 2015, in Nashville, Tenn. (AP Photo/Mark Humphrey)
Derek Mason

Vanderbilt head coach Derek Mason waves to the fans after beating Massachusetts 34-31 in an NCAA college football game Saturday, Sept. 13, 2014, in Nashville, Tenn. It was the first win for Mason at Vanderbilt. (AP Photo/Mark Humphrey)
Derek Mason

Derek Mason, center, talks with Chancellor Nicholas S. Zeppos, left, and athletic director David Williams, right, after Mason was introduced as the new Vanderbilt football coach during an NCAA college football news conference Saturday, Jan. 18, 2014, in Nashville, Tenn. Mason was previously the defensive coordinator at Stanford. (AP Photo/Mark Humphrey)
Derek Mason

Stanford defensive coordinator Derek Mason takes questions during a news conference on Saturday, Dec. 28, 2013, in Los Angeles. Stanford faces Michigan State in the 100th Rose Bowl NCAA college football game on New Year's Day. (AP Photo/Damian Dovarganes)
Derek Mason

In this Dec. 27, 2012 file photo, Stanford's defensive coordinator Derek Mason talks during a news conference in Los Angeles. Like the venture capitalists who visit this Silicon Valley campus searching for new ideas every year, about a half-dozen NFL teams sent coaches this offseason to see Mason, whose unit has become its own kind of innovator in the offensive-oriented Pac-12 Conference. Every coach wanted to know: Just what has been Stanford’s secret to slowing down read-option and hurry-up offenses? Mason swears there’s no magic formula. (AP Photo/Nick Ut, File)
Derek Mason

Stanford associate head coach and co-denfensive coordinator Derek Mason talks during a Fiesta Bowl NCAA college football game news conference on Thursday, Dec. 29, 2011, in Paradise Valley, Ariz. Stanford is scheduled to face Oklahoma State in the Fiesta Bowl on Jan. 2. (AP Photo/Ross D. Franklin)