As Rod Marinelli's son-in-law he ran a 4-3 for his one year as DC in Detroit
During his 2 seasons as DC in Washington he ran a 3-4
I think this from USATODAY speaks volumes:
"Barry's dismissal comes after the Washington defense ranked No. 28 in the NFL as the Redskins fell short of the playoffs. The team also was dismal in the run game, allowing 119.8 yards per game (No. 24 in the NFL). Opposing teams rushed for 140 yards or more in each of the final three games of the Redskins' playoff push, which ended with a 19-10 loss to the New York Giants in the regular-season finale.
Barry's 3-4 defense struggled significantly on third downs in 2016. Washington ranked dead last when it came to stopping teams then, allowing opponents to convert on 46.63% of chances."
[
www.usatoday.com]