Richard Diebenkorn was a well-known 20th century American painter

Visual arts of the United States

American art encompasses the history of painting and visual art in the United States. In the late eighteenth and early nineteenth centuries, artists primarily painted landscapes and portraits in a realistic style. A parallel development taking shape in rural America was the American craft movement,...

. His early work is associated with Abstract expressionism

Abstract expressionism

Abstract expressionism was an American post–World War II art movement. It was the first specifically American movement to achieve worldwide influence and put New York City at the center of the western art world, a role formerly filled by Paris...

 and the Bay Area Figurative Movement of the 1950s and 1960s. His later work (best known as the Ocean Park paintings) were instrumental to his achievement of worldwide acclaim.
Richard Clifford Diebenkorn Jr. was born on April 22, 1922 in Portland, Oregon

Portland, Oregon

Portland is a city located in the Pacific Northwest, near the confluence of the Willamette and Columbia rivers in the U.S. state of Oregon. As of the 2010 Census, it had a population of 583,776, making it the 29th most populous city in the United States...

. His family moved to San Francisco, California

San Francisco, California

San Francisco , officially the City and County of San Francisco, is the financial, cultural, and transportation center of the San Francisco Bay Area, a region of 7.15 million people which includes San Jose and Oakland...

, when he was two years old.