The St. Louis Rams have hired Rob Ryan as their defensive coordinator, a league source told ESPN NFL Insider Adam Schefter.

The boisterous Ryan was fired as defensive coordinator of the Dallas Cowboys on Jan. 8, soon after owner Jerry Jones said he would make major changes to a team that finished 8-8 and missed the playoffs.

After his ouster in Dallas, Ryan said, "I'll be out of work for like five minutes."

Jones alluded to two losses -- at Seattle in Week 2 and to Chicago at Cowboys Stadium in Week 4, when Dallas' defense was almost completely healthy -- as part of the reasons he let Ryan go.

Under Ryan, the Cowboys' defense was 19th overall, 17th against the run and 21st against the pass.