Martin Varsavsky is a serial entrepreneur, a professor and an investor who has founded seven companies in the US and Europe in the last 25 years. In 2015, Martin founded Prelude, a $200-million fertility treatment company. Prelude promotes fertility preservation and genetic testing to dramatically improve people’s chances of having healthy babies. In the 1990s, he built Viatel, which became the first pan-European fiber optic network, followed by Jazztel, a telephone operator. In the early 2000s, he built Ya.com, which was sold to Deutsche Telekom a few years later for $ 650 million. Martin subsequently co-founded Eolia, one of Spain’s largest renewable energy companies; and launched Fon, the world’s largest WiFi network with more than 20 million wireless access points. Martin is currently the largest shareholder and Chairman of Fon and Chairman of Prelude. Martin also teaches entrepreneurship at Columbia Business School and is a member of the board of the German media company Axel Springer.