Mesosphere, most recently valued at $725 million in a funding round this year, is getting a new CEO. Founder Florian Leibert is stepping aside to make way for Mike Fey, most recently COO of Symantec. Leibert had previously announced his intention to find his own replacement. Fey sees a lot of opportunity in bringing Mesosphere's software to larger customers, to help them manage their server and cloud infrastructure. Fey says he was first intrigued by Mesosphere's all-star roster of investors, which include Khosla Ventures, Microsoft, Andreessen Horowitz, T. Rowe Price, and Hewlett Packard Enterprise.