Stephen Petrus is a historian of 20th century America and author of Folk City: New York and the American Folk Music Revival. In this conversation, he tells me about discovering the world of beat poetry, folk music, and a rising "counterculture" in his younger years, and how becoming an academic historian led him to explore the complex social, political, and economic trends that created such a potent cultural moment in 1950s and 1960s New York City.