Dr. Siepenkothen studied dentistry at Johann-Wolfgang- Goethe University in Frankfurt Main and obtained his doctorate in 1994 with the title DrMedDent. From 1993 to 1995, he first worked as a dental assistant and was then employed as a dentist in an oral-surgical practice in Frankfurt. In 1995, he set up his own practice at Kelkheim im Taunus and has since then been working in implantology. In 1997, he set up the Working Group for Periodontology and Implantology with Dr. Mick Dragoo. Apart from further training for certification with an emphasis on implantology, he qualified in 2003 as a specialist in periodontology and as an EDA specialist in periodontology. Dr. Siepenkothen is also a member of the DGZMK and the DGP.