Cochran then decided to become a Chinese historian .
Cochran then completed his M.A. and Ph. D. at Yale in 1967 and 1975 , respectively , where he was a student of Mary C. Wright and Jonathan Spence .
Cochran then decided to become a Chinese historian and completed his M.A. and Ph. D. at Yale in 1967 and 1975 , respectively , where he was a student of Mary C. Wright and Jonathan Spence .