Henry Blackburn was not at UNC but overlapped with Al Tyroler in era and research
Henry Blackburn's CVD Epi history pages are at http://www.epi.umn.edu/cvdepi/
"Cassel brought his social medicine ideas and rural health experience to North Carolina, where he promulgated the concepts and study methods of social epidemiology, hypothesizing “stress factors” of rapid social change as disease inducing and social networks as protective of disease." HB