Frank Thelen is a businessman based in Bonn, Germany. He was a co-founder of companies such as Softer Solutions and doo. As of 2014, he is the CEO of venture capital firm e42, which has invested in startups such as Wunderlist. Thelen consults for the Microsoft Ventures accelerator in Berlin, and in 2014 joined the German version of the TV show “Dragons' Den”, called Die Höhle der Löwen (Lions' Den), a reality show that invests in startups. He also supports startups in German politics.