Kotkin is the author of eight previous books, including The Human City: Urbanism for the Rest of Us and the highly praised The New Class Conflict. He co-edited the 2018 collection Infinite Suburbia. Kotkin's books The City: A Global History and Tribes: How Race, Religion and Identity Are Reshaping the Global Economy, were published in numerous languages including Spanish, Chinese, Korean, Japanese, German and Arabic. Kotkin has published reports on topics ranging from the future of class in global cities to the places with the best opportunities for minorities.
Kotkin has conducted major studies on demography and urbanism in East Asia, the United Kingdom, Canada, and many cities in the United States.