Iván Szelényi walks through Max Weber's theory of class as part of Yale's Foundations of Modern Social Theory course. He contrasts Weber's view with Marx, arguing that class is a distinctly modern phenomenon tied to legal-rational authority and market position, replacing the status-based hierarchies of feudal society where monarchs conferred rank before wealth followed. Szelényi defines Weber's categories of class and status group, showing how status persists alongside class in contemporary institutions much as traditional and charismatic authority linger under legal-rational systems. The lecture closes by comparing class and status directly and cataloging Weber's types of classes. Chapter markers cover exam remarks, an introduction to Weber on class, definitions of class and status group, and the final comparison. Recorded in Fall 2009, the lecture runs about 45 minutes and is drawn from Yale's SOCY 151 course, part of Open Yale Courses.