Kazem Sohraby, PhD, is Professor of Electrical Engineering in the College of Engineering at the University of Arkansas. Dr. Sohraby has also served as head of the university's Department of Computer Science and Computer Engineering, and as Director of Telecommunications Management Department at Stevens Institute of Technology, Hoboken, New Jersey. Prior to his university appointment, Dr. Sohraby spent much of his career at Bell Labs Advanced Communication Technologies Center. His work resulted in more than twenty new patents for Bell Labs. Daniel Minoli has worked and published extensively in the field of IT security, with more than thirty years of hands-on experience in IT, telecommunications, wireless, and networking. He has helped develop systems and solutions for such organizations as Advanced Research Projects Agency (ARPA) think tanks, Bell Telephone Laboratories, ITT, Prudential Securities, Telcordia (Bell Communications Research), AT&T, Leading Edge Networks, Capital One Financial, SES Americom, New York University, Rutgers University, Stevens Institute of Technology, and Societe Generale de Financement du Quebec. His columns have been published in Computerworld, Network World, and Network Computing. Taieb Znati, PhD, is a Professor in the Department of Computer Science at the University of Pittsburgh. Dr. Znati's recent work focuses on the design and analysis of network protocols for wired and wireless communications, sensor networks, network security, agent-based technology with collaborative environments, and middleware.