Ability to: direct, plan, organize, and coordinate the work of a central purchasing agency; plan, assign, and review the work of subordinates; review and control purchasing transactions and records; review contracts and agreements for propriety and legality; interpret laws, ordinances, and regulations and initiate and implement appropriate policies, procedures, and guidelines; establish and maintain effective working relationships with other employees, County officials, vendors, representatives from other departments and agencies, and the public; direct research and recommend changes in County procurement and supply methods and practices; develop and implement guidelines, policies, and procedures; write clearly and concisely; and speak effectively before groups. Advises County departments and agencies on the appropriate modes of procurement, competitive sealed bids, competitive sealed proposals, professional services, sole source, exempt procurement from HRS 103D, emergency, and small purchases, and the requirements and procedures for each.