Mark Stuart Day

Mark Stuart Day joined the Institute as a Visiting Fellow in spring 2012. As chief scientist at Riverbed, he has led the company’s competitive analysis and contributed to its technical strategy since 2004, as the company has grown from a 40-person start-up to a public company with more than 2,500 employees. Before Riverbed, he was technical lead for product management in the content networking business unit of Cisco Systems. He joined Cisco with the acquisition of SightPath, a Boston-area start-up. Before that, he was at Lotus, where his work contributed to the creation of Lotus Sametime. Dr. Day has chaired Internet Engineering Task Force (IETF) working groups on instant messaging and presence protocol (IMPP) and content internetworking (CDI). He holds more than 30 patents relating to presence, streaming media, content networking, mobile communications, security, and telephony. Dr. Day’s other notable work includes contributions to the programming languages Argus and Theta, and to the distributed object database Thor. He has also served as an adjunct professor at Harvard University. He received his PhD in Electrical Engineering and Computer Science from MIT in 1995.