Ranjan K. Mallik is a Professor in the Department of Electrical Engineering, Indian Institute of Technology (IIT) Delhi. He received the B.Tech. degree from IIT Kanpur and the M.S. and Ph.D. degrees from the University of Southern California, Los Angeles, all in electrical engineering. He has worked as a scientist in the Defence Electronics Research Laboratory, Hyderabad, India, and as a faculty member in IIT Kharagpur and IIT Guwahati. His research interests are in diversity combining and channel modeling for wireless communications, space-time systems, cooperative communications, multiple-access systems, power line communications, difference equations, and linear algebra. He is a recipient of the Shanti Swarup Bhatnagar Prize and the Hari Om Ashram Prerit Dr. Vikram Sarabhai Research Award. He is a member of Eta Kappa Nu, and a fellow of IEEE, the Indian National Academies INAE, INSA, NASI, and IASc, TWAS, IET(U.K.), IETE(India), and The Institution of Engineers (India). He served as an Area Editor and an Editor for the IEEE Transactions on Wireless Communications, and as an Editor for the IEEE Transactions on Communications.