Timothy O'Farrell is Chair Professor in Wireless Communications at the University of Sheffield, UK. He is an expert in wireless communication systems specializing in physical layer signal processing, radio resource management, and wireless network planning. He has pioneered research on energy efficient mobile cellular communications, the mathematical modeling of CSMA based MAC protocols for WiFi, iterative block coding for wireless communication systems and spreading sequence design for CDMA wireless networks. Professor O'Farrell is a Chartered Engineer and a member of the IET and IEEE.