Hon. Martin L. Cowen III ProfileReviewsHon. Martin L. Cowen III completed law school at University of Georgia and has been practicing law since 6/13/1975. Hon. Martin L. Cowen III is located in Jonesboro, GA Leave a Review Cancel reply Your email address will not be published.Review text Select a rating Overall Name Email Website Save my name, email, and website in this browser for the next time I comment.