 He entered the life insurance business with Acacia Mutual Life Insurance Company, and earned his professional designations – Chartered Life Underwriter (CLU) & Chartered Financial Consultant (ChFC) – from The American College of Financial Services in Bryn Mawr, PA in October, 1984.During the early-1980s, David was an EMT/Firefighter with the New Market District Volunteer Fire Company, and a volunteer EMT driver as Frederick County initiated its Paramedic program.In 1994, Brinkley was elected to the House of Delegates, serving two terms representing District 4A.