Lawrence Harte is president of APDG, a telecommunications consulting firm. He was an editor of the TIA TR45.3 digital cellular standard, and has written over 75 articles on telecommunications. He is based in Fuquay, North Carolina. Richard Levine is professor of cellular and PCS technology at Southern Methodist University and a telecommunications consultant to firms developing PCS systems. He is a former chair of the North American digital standards committee of the Telecommunications Industry Association.