Dietz is a three-time successful entrepreneur with WebLogic, Zimbra, and Transarc. Most recently, he was President and CTO of Zimbra, a vendor of open source messaging and collaboration software. Zimbra (now part of VMware) was a pioneer of the Web 2.0 and Open Core paradigms. Zimbra was originally acquired by Yahoo! for $350m, where Dietzen served as interim SVP of Communications and Communities, helping to look after Yahoo! Mail, Messenger, Flickr, Groups, Answers, and Zimbra, and managing a 600+ person organization and the associated P&L.
Prior to Zimbra, Dietzen was CTO of BEA Systems, where he helped craft the technology and business strategy for WebLogic that drove BEA from $61m in annual revenues prior to the WebLogic acquisition to over $1B. Dietzen came to BEA in 1998 via the $200m+ acquisition of WebLogic, an innovator in Java and web application server technology. The WebLogic team helped launch the Web application server category, the J2EE standard, the Java Community Process, and web services (in collaboration with Microsoft and IBM).
Prior to WebLogic, Dietzen was Principal Technologist of Transarc (acquired by IBM), a developer of distributed transaction and file sharing systems. He earned his Ph.D. and M.S. in Computer Science and B.S. in Applied Mathematics and Computer Science from Carnegie Mellon University.