Rainer has been a member of the Holtzbrinck Ventures team since 2008 and played a significant role in the sale of Brands4Friends to Ebay. Rainer is responsible, among other things, for Holtzbrinck Ventures' investments in Zalando, home24, Fashionforhome, Stylight, HelloFresh and Outfittery. Before coming to Holtzbrinck Ventures, Rainer played an entrepreneurial role as Head of Business Development at 123people.com. The business was sold successfully to Pages Jaunes in 2010. Prior to that, Rainer worked for five years in the venture capital field at 3i and Siemens Acceleration, where he was involved in investments in the e-commerce sector. Rainer started his career at Siemens in 2000. Rainer studied Electrical Engineering at the Technical University of Munich and received his MBA at INSEAD, graduating both with honors.