His research centers on several main issues: (1) the implications of religion and spirituality for mental and physical health and mortality risk; (2) religious variations in family life, with particular attention to intimate relationships and childrearing; (3) the role of religious institutions, practices, and values among racial and ethnic minority populations in the United States; (4) the influence of religious factors on political attitudes and policy preferences; and (5) public opinion surrounding issues of race, ethnicity, and immigration in the contemporary United States.