Weidner began his professional career, playing for the FC Nurnberg (German Bundesliga) A-Youth team in 1988. He returned to the United States soon after to attend the University of California, Irvine where he received his B.A. in Film. Weidner became the third-highest scorer in school history and was voted to the Mountain Pacific All-Conference Team in 1992 alongside players such as Cobi Jones, Joe-Max Moore, and Brad Friedel.

After graduation, Weidner returned to Germany and professional soccer. In 1995, he played for Second Division FC Homburg, a team where U.S. National team captain Thomas Dooley also got his start. The following year, he elected to play for a former Bundesliga team, Borussia Neunkirchen, where he helped this team into the final rounds of the DFB Pokal (German Cup) and was voted to the Oberliga Team of the Year. Weidner ended his career in 1999 at SV Elversberg in the 3rd Division, playing a total of seven years professionally in Germany.

Weidner's DFB License allows him to coach at the professional level in Europe. He also writes, directs, edits and produces feature films with his production company, Shannon River Productions. His most recent film, The Spirit Hunter, won multiple awards at film festivals and has received a national DVD release. (See the film’s website at www.thespirithunter.com) He is currently at work on an independent film about the super-hooligan soccer fans in England, called Game Over. He is married to his wife, Shannon, and has a son, Landon, and two daughters, Kirian and Vienna.