As finishing his master’s degree and a doctorate in Psychology on Columbia University, Garry published many publications on the addictions. He spent years in research of alcohol and various drugs where achieved high-quality knowledge and experience. After a short time he started to share it with students as he started to work as a Professor of Psychology. For a longer time now he is also volunteer president in one of the biggest international, non-profit, science based groups for abstaining from any addiction. Many of Dr. Harrell’s publications, including this on-line part of his work, are helping to a huge number of individuals to understand addictive behavior.