J. Siewert is a German football coach. J. Siewert is 43 years old. J. Siewert's Sportra profile includes coaching career history, trophy record, sideline information where available, and related football news. Follow J. Siewert's career path, recent appointments, and club context through the dedicated coach hub on Sportra. On Sportra you can view J. Siewert coaching career history, honours, sideline updates, and related news.