In addition, Yamaguchi, founded and chairs, along with Chef Alan Wong, the Hawaii Food & Wine Festival. He established the Tom and Warren Matsuda Scholarship Fund, providing scholarships to students to attend the Culinary Institute of the Pacific. Founding the Roy's Annual Golf Classic more than 17 years ago, Yamaguchi has been instrumental in raising more than $400,000 for Imua Family Service. Yamaguchi also serves as trustee and/or member of nonprofit boards, including the U.S. Japan Council, Go For Broke, Culinary Institute of the Pacific, Hawaii Culinary Education Foundation and Good to Grow.