Stefan is an entrepreneur and investor from Germany who enjoys living in London. He is the co-founder of companions.de, companionsTV, ricardo.de and myblog.de. He is the founding investor and executive Chairman of Mendeley.com and RjDj.me and has been and in the same role at Last.fm. Stefan is a firm believer in European entrepreneurship and an active angel. He holds a PhD in foreign exchange risk management and was a professional DJ for 15 years.