ORG Cisco Systems Title Principal Engineer BIO Yixing (Eddie) Ruan, PhD, is a Principal Engineer in High End Routing and Optical (HERO) BU at Cisco Systems. Dr. Ruan holds a PhD, in Mathematics and a MS in Computer Network and Electrical Engineering from the University of Southern California, USA in 2000 and 1997. He graduated from Peking University, Beijing, China with a B.S. in Information Science in 1994. Dr. Ruan is the holder of two US Patents and author of several technical papers in Sigcomm and other conferences.