Prof. Wiechmann has been in private practice since 1998 in Bad Essen, Germany, which is actually the biggest lingual practice in the world with more than 800 lingual patients in active treatment.
From 2002 to 2011 he was the Scientific Director of the postgraduate diploma program in Lingual Orthodontics at the University Paris 7 in France. By 2006 he had also become Scientific Director for the postgraduate MSc. program in Lingual Orthodontics at the Hannover Medical School, Germany. In 2011 he received the honorary price of the French Federation of Orthodontics.
He received his PhD in 2011 with his paper: Different aspects of a completely customized lingual appliance. Since 2013 he is a Professor in Orthodontics at the Hannover Medical School.