He was appointed Head Coach of the Lincoln Brigade in 1997 in the USL Premier Development League, finishing regular season as Division Champions but losing in the Play Offs first round to Des Moines Menace.
The following year he was appointed Head Coach for the Atlanta Silverbacks, where the team finished 3rd in the Southeast Division.
[1] In January 2015 he was appointed head coach for the newly acquired franchise the Toronto Lady Lynx competing in the USL W-League.
Mosen was named as the first head coach and Director of Football in the history of K-W United FC.
[3] On 31 January 2014 Mosen returned to the Toronto Lynx to serve under Duncan Wilde once more as part of his coaching staff.