1. Professor of Criminal Justice/Forensic Science, Department of Criminal Justice, Albany State University, 504 College Drive Albany, GA 31705, US.
2. Technical sergeant/firearms examiner, and formerly senior photographer, respectively, New York State Police Crime Laboratory, Building #22, State Campus, Albany, NY, US.
3. Forensic firearms examiner, Federal Bureau of Investigation Laboratory, J. Edgar Hoover Bldg., Room 3787, 935 Pennsylvania Avenue, N.W., Washington, D.C. 20535, US.