Allan Kaprow helped to develop the "Environment" and "Happening" in the late 1950s and 1960s, as well as their theory. His Happenings - some 200 of them - evolved over the years, and in their present humorous form are nearly indistinguishable from ordinary life. Kaprow's work attempts to integrate art and life. Through Happenings, the separation between life and art, and artist and audience becomes blurred. He has published extensively and is Professor Emeritus in the Visual Arts Department of the University of California, San Diego.