After receiving his PhD from Cornell University in 1968, since the academic year 1969-1970 he has been at UCR. He has been Faculty Research Lecturer at UCR, and in the profession, he has been president of the Pacific Sociological Association and California Sociological Association. He is also a Fellow of the American Association for the Advancement of Science. He has lectured widely all over the world, and he has been a visiting professor at Cambridge University, UK, Universitat Bremen, Germany, Universitat Bielefeld, German, Shandong University and Nan Kai University, Peoples Republic at China.
He is know as a general theorist of sociology, although he has a number of specialities: the sociology of emotions, ethnic relations, social institututions, social stratification, and bio-sociology.
He is an author of several books, including textbooks, and articles.