His first published book, “Black Citymakers: How the Philadelphia Negro Changed Urban America,” revisits the Black Seventh Ward neighborhood immortalized in W.E.B. DuBois’ “The Philadelphia Negro” and follows the transformation of the neighborhood from predominantly black at the beginning of the 20th century into a largely white upper-middle-class and commercial neighborhood. His course “Intersectional City: Identity and Inequality in Urban America” poses questions related to inequality, crime, gender, sexuality, education, homelessness, and redevelopment, and through the class discourse encourages students to consider each issue through a multitude of perspectives.