 Complete the following phrase:  Born in Oklahoma, Mace did his undergraduate studies at the Oklahoma State University, graduating with a B.A. in history in 1973. He pursued his graduate studies at the University of Michigan, where he studied with Roman Szporluk, receiving a Ph.D degree in 1981, with a thesis on national communism in Soviet Ukraine in the 1920s. Starting in July 1981, Mace worked as a postdoctoral fellow at the Harvard Ukrainian Research Institute. Following the advice of Omeljan Pritsak, the director of the Institute, he started doing research for Robert Conquests book on the 