Critical theory has many faces; its complexities and nuances present a challenge to those seeking to engage with its thought. In order to understand critical theory today, we must first understand its origins, its development, and its consequences. To Change All Worlds: Critical Theory from Marx to Marcuse by Carl R. Trueman is an accessible introduction to the history and development of critical theory. From Hegel and Marx, to Korsch and Lukacs, to the Frankfurt School, to Wilhelm Reich and Herbert Marcuse--Trueman focuses on the key figures of critical theory, positioning them within their historical context and tracing the development of critical theory through its various movements, evolutions, nuances, and consequences.