Garner Shimizu holds a Mechanical Engineering degree from the University of Hawaii. He spent several years as a successful business owner in the sheet metal industry, showcasing expertise in entrepreneurship and small business management. Shimizu has dedicated time to community service, participating in local governance and development through various board and association roles. Currently, he serves as a member of the Hawaii House of Representatives, where he will focus on judiciary, Hawaiian affairs, water and land, and public safety issues.

Garner Shimizu's political identity is marked by a distinctive blend of local governance and environmental stewardship, underpinned by a background in small business. His active engagement in community service and leadership roles suggest a deeply rooted commitment to local issues, while his committee assignments reveal an unexpected alignment with environmental and Native Hawaiian rights causes. Shimizu's approach to policymaking appears highly localized, balancing regional industrial interests with broader environmental concerns.