Ronald C. Wornick got a lot done. He turned an MIT degree in food science into a sterling career as a corporate executive and business owner, creating thousands of jobs. He headed a large and loving family. He was an accomplished woodworker and art collector. He sat on scores of Jewish community boards, and he became a high-impact philanthropist. Yet nothing made him happier than interacting with students at the Foster City Jewish day school that has borne his name since 2004. Wornick died July 31 in San Francisco after a long illness. He was 89. “He never left anything half done,” said his son Kenneth Wornick. “He self-assigned huge projects in every sphere of industry, philanthropy and art.”