Greer's research focuses on American politics, black ethnic politics, urban politics, quantitative methods, Congress, New York City and New York State politics, campaigns and elections, and public opinion.
Reviews Obama's place and legacy as a Black president.
Examines the movement and diversification of Black populations in the United States in recent decades. Examines the impact of immigration on Black populations, movements from urban to suburban areas, and the inverse as middle and upper class whites reenter urban spaces and gentrify neighborhoods.
Explores the history of African-Americans running for executive office, how over 50 campaigns before Obama's failed, and how the shifting parties increased African Americans' participation in U.S. politics.
Lays out an original theory of elevated minority status, where Afro-Caribbean and African migrants are viewed as better or different than native-born blacks by whites, but still not seen as model minorities like Asian American groups.