Cray Inc. announced the appointment of Stathis Papaefstathiou to the position of senior vice president of research and development. Papaefstathiou will be responsible for leading the software and hardware engineering efforts for all of company’s research and development projects. With more than 30 years of high tech experience, Papaefstathiou has held senior-level positions at Aerohive Networks, F5 Networks, and Microsoft. In his most recent position at Aerohive, Papaefstathiou was the senior vice president of engineering and led product development across the company’s entire product portfolio, including network hardware, embedded operating systems, cloud-enabled network management solutions, big data analytics, and DevOps. Papaefstathiou will take over the position currently held by Peg Williams, who is retiring from company. Papaefstathiou will work with Williams through a transition period prior to her retirement.