The addition was later confirmed by WVU Coach Dana Holgorsen's Twitter page, not long after wrapping up an interview with another candidate for the job.Seider, who has his B.S. and master's degrees from WVU, arrives after three seasons at Marshall. Seider is an original member of Doc Holliday's Herd staff and has been running backs coach and recruiting coordinator since January 2010.
Before working as a graduate assistant at WVU, he served on the staffs at Lake Worth (2006-08), Palm Beach Lakes (2003-05) and Glades Central (2001-02) high schools.
Seider was a quarterback at WVU from 1996-98 and finished his career at Florida A&M, where he won the Doug Williams Award for National Offensive Player of the Year at the Division I-AA level and the Jake Gaither Award, which is considered the Heisman Trophy for black colleges.
As a senior at FAMU, Seider passed for 2,512 yards and 27 touchdowns.
He's the fifth assistant hired by Holgorsen this offeseason.
"Welcome Home WVU grad JaJaun Seider as WVU RB Coach. The T.E.A.M. is finally ready for Sunday's Spring FB #1," Holgorsen said on Twitter.
Robert Gillespie vacated Seider's spot March 1 when he left for the same job at Tennessee. Eight days before that, offensive line coach Bill Bedenbaugh took the same job at Oklahoma. Before him, quarterbacks coach Jake Spavital moved to coach Heisman Trophy winner Johnny Manziel at Texas A&M.
Holgorsen previously fired cornerbacks coach Daron Roberts and special teams coach Steve Dunlap, though Dunlap is still working for WVU in an alternate capacity and is expected to accept a permanent position soon.
Stanford offensive tackles/tight ends coach Ron Crook, a Parkersburg native, replaced Bedenbaugh and Holgorsen moved receivers coach Shannon Dawson from receivers coach to quarterbacks coach to address Spavital's exit. Lonnie Galloway was then hired away from Wake forest to return to WVU to coach receivers.
Former East Carolina defensive coordinator Brian Mitchell was hired as cornerbacks coach and Tony Gibson left Arizona to return to WVU to coach safeties. That allowed Joe DeForest, who was the safeties coach and defensive coordinator, to move to special teams coordinator while linebackers coach Keith Patterson took over the defense.
Marshall's running game improved significantly under Seider this past season. In 2011, the Herd was ninth in the 12-team Conference USA and 96th in the Football Bowl Subdivision, averaging 120.1 yards per game.
That average jumped to 169.2 yards per game on the strength of a trio of freshman running backs -- Kevin Grooms, Steward Butler and Remi Watson. That average ranked Marshall fourth in C-USA and 54th in the FBS.
Grooms was named the conference's freshman of the year after leading all CUSA freshman running backs with 737 rushing yards and leading the Herd with eight rushing touchdowns. His 6.1 yards per carry was second best in the conference.
Seider's recruiting ability also bolstered Marshall's roster. In patrolling talent-rich Florida for the Herd, he was either the primary recruiter or one of two primary recruiters for eight of Marshall's 29 2013 signees. Included in that group are linebacker Jeremiah Benjamin, receiver Angelo Jean-Louis and defensive back Michael Johnson. All three were rated four-star prospects by at least one recruiting website.
With Seider as recruiting coordinator, Marshall's was rated the top 2013 recruiting class both in Conference USA and among non-BCS automatic qualifier conferences by 247Sports, landing at No. 48. That website uses a composite ranking system that takes into account how all recruiting sites rate each prospect.
With Seider's departure, only two remain from Holliday's original staff -- offensive coordinator Bill Legg and assistant athletic director for football operations Mark Gale, who held that position before Holliday's 2010 arrival.
However, Marshall sources say the team is expected to bring back another member of that original group, former defensive line Coach Sean Cronin. Cronin coached one season at Marshall before joining Temple's staff in 2011.
Cronin would reunite with father-in-law Chuck Heater, the former Temple defensive coordinator who became Marshall's defensive coordinator in January.