 Complete the following phrase:  Beginning his career in the San Francisco Bay Area, California, in 1949, Halprin often collaborated with a local circle of modernist architects on relatively modest projects. These figures included William Wurster, Joseph Esherick, Vernon DeMars, Mario J. Ciampi, and others associated with UC Berkeley. Gradually accumulating a regional reputation in the northwest, Halprin first came to national attention with his work at 