In 1942, Reddick was awarded a second Rockefeller education fellowship by Radcliffe College, the women's coordinate for Harvard University at that time.[1] Reddick studied techniques for transplanting tissues and nerve cell differentiation in chick embryos there for two years, gaining a second master's degree in biology in 1943 and being awarded a PhD in 1944.[2][3] Her doctoral dissertation was titled The differentiation of embryonic chick medulla in chorioallantoic grafts.[5] She was elected to the Phi Beta Kappa and Sigma Xi honor societies.[1] Geraldine Pittman Woods was a classmate.[1] Reddick was the 10th member of Morehouse faculty to earn a doctorate.[1]