Final answer:
Tom Vilsack, a former governor of Iowa, has served as the Secretary of Agriculture since 2009, where he focuses on agricultural policies and food systems, separate from the foreign policy focus of the Secretary of State.
Step-by-step explanation:
A former governor of Iowa, Tom Vilsack, has served as the Secretary of Agriculture since 2009. His role includes leading the U.S. Department of Agriculture (USDA) and focusing on issues related to farming, food safety, and nutrition. Vilsack's work often involves discussions on agriculture policies and initiatives, as illustrated by his participation in the National Congress of American Indians Tribal Nations Legislative Summit in 2012 and his involvement in discussions at COP26 in Glasgow, Scotland, on climate-smart agriculture and food system in 2021. His service as Secretary of Agriculture differentiates from roles such as the Secretary of State, a position that was held by Hillary Rodham Clinton, who was a primary leader in determining U.S. foreign policy and not directly involved in domestic agricultural policies.