Richard A Walker

Dr. Richard Walker -- Author -- has taught biology at the high-school and college levels, and is the author of many biological books. Dr. Gabrielle Murphy -- Consultant -- is a specialist in infection and immunology, a medical consultant, and an author.

Dr. Richard Walker -- Author -- has taught biology at the high-school and college levels, and is the author of many biological books. Dr. Gabrielle Murphy -- Consultant -- is a specialist in infection and immunology, a medical consultant, and an author. See less