1969 to 1973
1972
1973
1973 to 1980
1978
1978 to 1979
1983 to 1994
1992 to 1993
1994 to 2009
2009 to 2013
2002
2002 to 2011
1986 to 2008
2009 to 2010
2010
1987, 1992
2006 to 2007
2008
2010
2012
2014
2016
2018
2020
2021 to 2024
2022
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Assistant Professor, Orthodontic Department, Freie Universität; Berlin, Germany
Doctorate (Dr. med. dent.)
Specialization in Orthodontics (Fachzahnarzt für Kieferorthopädie)
Professor, Orthodontic Department, Freie Universität; Berlin, Germany
Habilitation (Ph. D. degree)
Orthodontic Department, Louisiana State University; New Orleans, USA
Chairman, Department of Orthodontics and Pedodontics, Freie Universität; Berlin, Germany
Guest-professorship; Orthodontic Department, Royal Dental College; Århus, Denmark
Chairman, Department of Orthodontics, Humboldt Universität; Berlin, Germany
Chairman, Department of Dentistry, Hamad Medical Corporation; Doha, Qatar
Vice-Dean of the Centre of Oral Medicine, Charité, Humboldt Universität; Berlin, Germany
Council Member European Orthodontic Society
Editor-In-Chief Orthodontic Journal "Praktische Kieferorthopädie", later "Kieferorthopädie"
Editor-In-Chief "World Journal of Orthodontics"
Member of the Advisory Committee, College of the North Atlantic Qatar; Doha, Qatar
President of the Annual Conference of the German Society of Orthodontics; Berlin, Germany
President of the European Orthodontic Society
President of the German Association of Aligner Orthodontics
President 1st Congress of the German Association of Aligner Orthodontics; Cologne, Germany
President 2nd Congress of the German Association of Aligner Orthodontics; Cologne, Germany
President 3rd Congress of the German Association of Aligner Orthodontics; Cologne, Germany
President 4th Congress of the German Association of Aligner Orthodontics; Cologne, Germany
President 5th Congress of the German Association of Aligner Orthodontics; Cologne, Germany
President 1st Virtual Congress of the German Association of Aligner Orthodontics
Consultant Align Technology Scientific Advisory Board EMEA
President 7th Congress of the German Association of Aligner Orthodontics; Cologne, Germany
Honorary Member of the Lebanese Orthodontic Society
Honorary Member of the Thai Orthodontic Society
Honorable Consultant of the Macao Association of Orthodontics
Honorary Member of the Association of Orthodontics of Berlin and Brandenburg
Honorary Member of the German Association of Aligner Orthodontics
Co-Founder and Honorary President EurAsian Association of Orthodontists
Scientific expert for the DFG (German Research Society)
Reviewer for numerous professional scientific journals
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