Mr. DeMartini was born and raised in Stanislaus County. He graduated from Grace Davis High School. He has been farming since 1972 and he farms more than 1000 acres on the West Side between Patterson and Ceres. He grows almonds, walnuts, peaches, grapes and row crops.Jim DeMartini serves on the Board of the Gateway Rotary, the Board of the American Heart Association and is a member of the Elks Club. He is on the Central Valley High School Bond Oversight Committee, and is a past chairman of this committee. Mr. DeMartini is a member of the Stanislaus County Farm Bureau, the Latino Community Roundtable and the Patterson, Newman and Ceres Chambers of Commerce. Mr DeMartini is also chairman of the Republican Party of Stanislaus County. In 2004, he was elected to the Stanislaus County Board of Supervisors District 5.
Mr. DeMartini’s wife Anne serves as a trustee for the Yosemite Community College District and she is a member of the Modesto Symphony Orchestra