Prior to 2007, Koschat was Vice President of the Anglo Irish Bank, responsible for Russia and the regional intergovernmental organization CIS. In 2007, Koschat also founded his own company Pallas Capital.
Koschat was appointed to the Supervisory Board of CA Immo in May 2016 for the core shareholder O1. After the sale of the O1 shares to Immofinanz a power struggle arose around the largest real estate companies in Austria. This fight was triggered by a takeover bid by the Starwood Capital Group, which was threaded by Koschat and two other members of the board. Koschat served on the Supervisory Board of CA Immo for the full five-year term. Since May 2021, he has no longer been part of the CA Immo Supervisory Board.
As CEO of PALLAS CAPITAL Group AG, Koschat takes over medium-sized companies and develops them further together with the management. He also invests in the German real estate market. Koschat is also known for his performances in social media.
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