A former defensive coordinator at Air Force, Warren informed multiple recruits by phone on Monday night.
"It's icing on the cake," said cornerback Eric Lee, who reaffirmed his 100 percent commitment last week with Big Red Report.
On the recruiting front, Warren played a vital role in the Huskers landing both Lee and Avery Anderson - a four-star recruit in Colorado. He was also vital in securing a commitment from Georgia prep Aaron Williams. Warren is a native of Georgia.
Former head coach coach Bo Pelini described Warren multiple times as a fast learner and a great communicator.
"I have always thought Nebraska was one of the top schools in the country when it comes to their football tradition, fan support, fan base, and national recognition," Warren told Huskers.com in March. "I want to win football games. I'm as competitive as they get. They understand that, but I think they know that I'm interested in them as young men succeeding. Once they respect you from that standpoint, you can coach them hard. They might not like that I get on them hard, but they know I only do it because I care about them."
Last week, Riley announced the hiring of four assistant coaches, all four had been on his previous staff at Oregon State. With the news of Warren being retained, there are still three open spots on the assistant coaching staff.