in his mid-20s, he returned to harvard as a w. e. b. du bois fellow before becoming an assistant professor at union theological seminary in the city of new york. in 1985, he worked at yale divinity school in what eventually became a joint appointment in american studies. while at yale, he participated in campus protests for a clerical labor union and divestment from apartheid south africa. he was arrested and jailed at one of the protests. as punishment, the university administration canceled his leave for spring 1987, leading him to commute from yale in new haven, connecticut, where he was teaching two classes, across the atlantic ocean to the university of paris.