Gerald McClearn All publications ( 2 ) Whitfield KE. McClearn G. Genes, environment, and race: quantitative genetic approaches. 2005 Jan. Am Psychol. 60(1):104-14. National Institute on Aging Whitfield KE. Brandon DT. Wiggins S. Vogler G. McClearn G. Does intact pair status matter in the study of African American twins? The Carolina African American Twin Study of Aging. 2003 Oct-Dec. Exp Aging Res. 29(4):407-23. National Institute on Aging