Dr. Johann Killinger

Born in 1960, he studied law and then worked at Roland Berger consultants. In 1991, he joined the Buss Group in which his family were already company shareholders. It was here that he set up the logistics and logistics properties divisions (today Ixocon). In early 2002, Dr Johann Killinger became the full shareholder of the Buss Group. In 2003, he founded the Buss Capital GmbH & Co. KG issuing house and became director of shipping company Aug. Bolten WM. Miller's Nachfolger GmbH & Co. KG.



Stephan Weichselbaum

Born in 1976, he studied business administration and economics at Europa-Universität Viadrina in Frankfurt (Oder). In 2000, he came to Hamburg and joined the Buss Group where he has been in charge of all property development projects and acquisitions since 2001 with a total investment volume of more than 400 million euros from more than 40 projects. Stephan Weichselbaum has been Managing Director of Ixocon since June 2006 and his main areas of responsibility are project development, project management, property Management and property administration.

Dennis Hamann


Born in 1981, Dennis Hamann is responsible for the group’s transaction management and oversees all financial activities. Before being appointed as Managing Director in 2018 Dennis Hamann held different positions in Ixocon’s investment and finance department. He studied business administration at the private University of Applied Sciences FH Nordakademie and holds a Master of Arts in Real Estate Investment and Finance from EBS Universität für Wirtschaft und Recht, Oestrich-Winkel, as well as an Executive MBA in Real Estate from the University of Regensburg.