The Oakland Museum of California exists because three smaller institutions decided they were stronger together. The Oakland Public Museum had been operating since 1910 out of the Camron-Stanford House, a Victorian mansion on the shore of Lake Merritt, where its first curator, Charles P. Wilcomb, assembled collections spanning Native American artifacts and East Coast settler history. The Oakland Art Gallery opened six blocks away in the Municipal Auditorium in 1916. The Snow Museum of Natural History found its home in the Cutting mansion, also lakeside, in 1922. By 1954, the three had formed a nonprofit association with ambitions to merge. It took another seven years before Oakland voters approved a $6.6 million bond to build a unified campus, and the merged museum finally opened in 1969 overlooking Lake Merritt in the heart of the city.

Architect Kevin Roche of Roche-Dinkeloo designed the building as a series of three terraced tiers -- one for art, one for history, one for natural science -- with landscape architect Dan Kiley and garden designer Geraldine Knight Scott shaping the outdoor spaces. The result is a landmark of mid-century modernism where the line between inside and outside dissolves. Roof gardens cascade down each level, connected by patios, sculpture courts, a broad lawn, and a koi pond. A large yellow peace sign sits on the rooftop, freely visible to visitors and to anyone peering down from the surrounding hills. Between 2009 and 2013, Mark Cavagnero Associates led a major renovation funded in part by Measure G, a $23.6 million bond initiative Oakland voters approved in 2002. The art and history galleries reopened in 2010, the natural science wing in 2013, each space rethought for a generation that expects museums to be participatory rather than passive.

Among more than 1.8 million objects, certain collections define the museum's identity. The Dorothea Lange archive anchors the photography holdings -- her images of migrant workers and Depression-era California remain among the most powerful documentary photographs ever made. The Native Californian basket collection holds an estimated 2,500 baskets spanning the state's geographic and cultural regions, including an Ohlone basket commissioned in 2010 from artist Linda Yamane, a living link to a tradition stretching back millennia. The art wing houses over 500 paintings, drawings, and decorative objects by Arthur and Lucia Kleinhans Mathews, key figures in the American Craftsman movement whose work captures California at the turn of the twentieth century. The natural sciences department maintains more than 100,000 research specimens -- pinned insects, bird skins, herbarium sheets, shells -- documenting California as the most biologically diverse state in the nation.

The controversy that cost Jim Holliday his job did not end with his departure. Throughout the 1970s, community tensions simmered. The resolution came through Ben Hazard, a local artist hired as curator of special exhibits and education, who organized the Cultural and Ethnic Affairs Guild with neighborhood residents. The Guild established ethnicity-based advisory committees that shaped programming and acquisitions, a model the museum still follows. The location itself carried political charge: the campus sits adjacent to the Alameda County Court House, where protesters had gathered to demand freedom for Huey Newton, co-founder of the Black Panther Party, around the time the museum opened. OMCA has never been a place that could pretend art, history, and science exist apart from the communities that produce them. That founding tension -- between institutional authority and community voice -- continues to animate the museum's work.

The museum's collections have attracted unwanted attention more than once. In 2013, a thief broke in and stole a Gold Rush-era jewelry box crafted from California gold and adorned with gold-veined quartz, valued at $800,000. The box was recovered later that year, and the thief was sentenced to four years in federal prison. In October 2025, a more sweeping burglary saw more than 1,000 items stolen, including Native American baskets and jewelry. Investigators determined it was a crime of opportunity rather than a planned heist. These incidents underscore a tension inherent to any institution holding irreplaceable cultural artifacts: how to keep collections accessible while keeping them safe. For OMCA, whose founding principle was openness to the community, the balance is especially delicate.