Robert Bellah was an American sociologist and professor, best known for his work on the sociology of religion. He gained prominence for his book, Habits of the Heart, which explores individualism and community in American society. Bellah's research often focused on how religion shapes social values and cultural practices. Throughout his career, Bellah contributed to the understanding of civil religion in the United States, a concept he articulated in his influential essay, "Civil Religion in America." He examined how shared beliefs and rituals can unify a diverse society, highlighting the role of religion in public life and national identity.