History Beginnings. Granite Rock Company was founded on February 14, 1900 by Arthur Roberts (A.R.) Wilson and Warren R. Porter. Wilson was born in San Francisco in 1866, graduated from MIT with the class of 1890, and returned to California where he partnered with Kimball G. Easton in a Bay Area street paving and construction firm known as Easton and Wilson.
Headquarters: Watsonville, California