For more than half a century the sociologist Robin M. Williams, Jr., has used his consummate analytical and communicative skills to assess and explain the character, quality and contradictions of American culture. His career as a scholar, teacher, editor and leader in our profession, and his extensive writings--especially but not exclusively in the realm of "intergroup relations"--offer a powerful counter to the contention that sociology is moribund, that its practitioners have little of importance to say about the real lives of real people or to contribute to debates over America's unfinished agenda. For students and for younger colleagues in sociology, he is a perfect example of what his one-time teacher, Robert K. Merton, must have had in mind when he first used the expression, "role-model." (See Merton 1981) At once a courtly gentleman with a soft-southern voice and an easy-going manner reminiscent of another time and place, Robin M. Williams, Jr. is also very much the modern social scientist, a hard-driving worldly philosopher with a feisty spirit, an avid curiosity, and a rare gift for demonstrating in word and deed the integration of the Comtean trilogy of theory, research and practice. He is a role model, par excellence. This paper(n1) is an attempt to flesh out this bare-bones description. It is based on interviews with a number of people,(n2) including Williams himself, a reexamination of what he has written over the past 50 years and what some reviewers and critics said about it. Taken as a whole, my biographical and bibliographical inquiry revealed that many of the variables we sociologists are wont to highlight--"nature," "nurture," "membership groups," "reference groups," "time," "place" and "serendipity"--all played their parts in making Williams the man he became and in determining the directions his work would take. [ABSTRACT FROM AUTHOR]