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Columbia Mo (KSDK) -- Mizzou assistant head football coach David Yost resigned from the team's staff citing personal reasons.

David Yost's resignation is effective immediately.

He spent 17 seasons working with Coach Gary Pinkel. He initially joined Pinkel's staff at Toledo in 1996 as a graduate assistant, and from 1997-2000, was Pinkel's quarterbacks coach and recruiting coordinator, until moving to MU in the same position.

Prior to 2009, Yost was promoted to offensive coordinator, and in the fall of 2011, he had assistant head coach added to his title.

Yost also coached placekickers, and he worked with four kickers who won all-conference honors. Two of his kickers - Grant Ressel and Jeff Wolfert - earned national honors, with Ressel being named a 1st-Team All-American in 2009, while Wolfert preceded him as an honorable-mention All-American in 2007.

Pinkel said that he will conduct a national search for Yost's replacement, but that he will also consider internal candidates. There is no timetable for the timing of the hire.