Warren was an assistant at Southeast in 2012 under Paul Maechtle and spent last season as the head coach at Massac County High in Metropolis, Ill, where he went 3-6.
Warren coached the Seminoles' wide receivers and quarterbacks. He was one of four finalists for the head position, with the other three being Matt Kitchie, Brett Timmons and Brian McKnight.
"I enjoyed working with him," said Maechtle, who didn't have a hand in choosing a successor, said of Warren. "We were disappointed to lose him because at the time, we needed a good receivers coach.
"They were four very good candidates, and it must have been a difficult decision for our administration. But I think they picked a good man and I wish him the best of luck."
Kitchie, the head coach at Tampa Leto, and Timmons, the head coach and athletic director at Out-of-Door Academy, played and coached under Maechtle at Southeast; McKnight has been on Southeast's coaching staff since 1992 and has been the defensive coordinator since 2007.
Maechtle was Southeast's head coach for 33 years and retired after the 2013 season. He will stay on as the school's athletic director until April.
For more on this story, check out Wednesay's edition of The Bradenton Herald.