Description: [edan-image:id=siris_arc_392292,size=800,center]Dr. John Thomas, Jr., M.D. was a renowned clinician, epidemiologist, and research scholar who taught at Meharry Medical College for more than half century. When this photograph was made, he had just been appointed Research Collaborator at Brookhaven National Laboratory, where he was engaged in a study of the precursors of