Jerry C. Hammaker, part-time instructor of beverage and restaurant management at Penn College, authored an article for the June issue of PR%F (Proof) the Magazine, published by the brand that produces the PR%F Awards in partnership with Food & Beverage Magazine. The PR%F Awards is an international competition for spirits, wines and beverages. Hammaker, a certified specialist of wine, owns Certain Aged Ventures, which provides wine consulting and sommelier services.