ista Board


The ista international board has long and broad international expertise within the industry.

ista International Board

From left to right:
Christian Leu, Jochen Schein, Thomas Zinnöcker, Laurent Sireix, Ulrich Fischer

Thomas Zinnöcker

Chief Executive Officer

Thomas Zinnöcker, born 1961, has assumed the role of CEO at ista on March 1, 2016. He has significant experience in the German real estate industry, having held a variety of management positions across different firms. As the Deputy CEO of Germany's largest housing company, Vonovia SE, he was last responsible in particular for the successful integration of the GAGFAH Group, where he had previously been the CEO since April 2013. Prior to that, he had headed GSW Immobilien AG for eight years. At ista, Thomas Zinnöcker is responsible for the ista Group including our regional businesses, the corporate functions of Communications and Public Affairs, Human Resources as well as Marketing and Business Development.

Ulrich Fischer

Chief Executive Officer Western Europe

Ulrich Fischer, born in 1966, is the CEO Western Europe and member of the ista Group board since October 1, 2017. He has valuable experience in the global submetering business, having held several national and international management positions at ista and its predecessors Viterra and Raab Karcher Energy Services. From 2009 to 2011 he was member of the board at Techem Energy Services before he returned to ista.

Christian Leu

Chief Financial Officer

Christian Leu, born in 1965, has been the CFO of ista International since May 2006. In 1989, he began his career as an analyst at Compaq Switzerland. After holding several positions at Compaq Switzerland and Compaq Germany, he worked for seven years as the CFO of Leica Geosystems prior to joining ista.

Jochen Schein

Chief Executive Officer Germany

Jochen Schein, born in 1972, was appointed CEO Germany on October 1, 2017. He began his career in Munich in 1998, working in an international management consultancy firm. In 2003, he moved to Essen taking up the position of Project Manager in Corporate Development at ista. In 2007, Jochen Schein was promoted to Chief Operating Officer of ista Germany. In 2010, he became COO of ista International.

Laurent Sireix

Chief Executive Officer France

Laurent Sireix, born in 1967, has assumed his role as CEO France on November 6, 2008. Since October 2017 he is also member of the ista Group board. He has broad experience in the energy industry having held several managing positions: E.g. he was Managing Director of Gaz France at Schlumberger. He joined ista France in 2004 as Director of Operations and then became Managing Director ista France in 2005.