I'm a physicist, retired at present. Here's my professional background: After undergraduate study at M.I.T, I completing graduate studies at the University of Chicago with a doctoral thesis in experimental low energy nuclear physics. After postdoc appointments at the University of Chicago and Argonne National Laboratory, I taught as a faculty member at Illinois Institute of Technology, the University of Illinois at the Medical Center, and California State University, Fresno. I also spent a couple of years as a research scientist at IIT Research Institute. Then for a number of years I worked as a member of the professional staff of Argonne National Laboratory, and retired from Argonne National Laboratory in March 2001. Subsequently I worked as a consultant in radiological emergency preparedness for a national technical consulting corporation, and also have been a consultant in various areas of science and engineering.