From the time questions about the impact of wireless technology on public health were first raised in 1993 through the present, Wireless Technology Research, LLC (WTR) has been the largest independent surveillance and research program trying to identify and solve human health problems associated with wireless phones. In 1995 at the University La Sapienza of Rome, WTR sponsored the first comprehensive forum for the discussion of these issues. Papers from the 1995 State of the Science Colloquium were collected andpublished in Volume I ofthis series, Wireless Phones andHealth: Scientific Progress. This second volume assembles papers presented at WTRs Second State of the Science Colloquium in Long Beach, CA, in June 1999; it contains the most comprehensive research on the public health impact of wireless phones to date. The operating words for the proper understanding of these data are science and public health. Science is a tool for making public health decisions, but the framework in which we are operating is truly that of public health. We are looking for problems that have to do with wireless technology. We are trying to decide how this technology impacts on the public for one purpose and one purpose alone, and that purpose is to solve problems that are identified. I would like to challenge you, the reader, to suspend your parochial orientation as you consider these latest findings.