About the author
Jeffery L. Hall, Ph.D. in Physics, has written more than 25 books and physics articles for Scientific Journals and worked for more than 30 years in Physics, as a Safety Protection Officer for military bases and government educational facilities. Jeffery L. Hall's physical basis for self defense educational presentations are used for beginning physics classes in public and private schools, recreation centers, and law enforcement training academies throughout the United States of America.