Frank became president of Southern Counties Oil Co. in 1987 at the age of 33 and acquired ownership of the company in 1991. At that time the company's annual revenue was $50 million. Today under Frank's leadership as Chief Executive Officer SC Fuels and its related companies generate over $2 billion in revenue and have operations in 11 western states.
Frank currently is a member of the Executive Committee of the Society of Independent Gasoline Marketers of America and a past director of the California Independent Oil Marketers Association. He is the former Chairman of the Southern California Chapter of Young Presidents Organization (YPO). Frank is also a founding director of The New Majority Committee; an Orange County based mainstream Republican organization and former Finance Chairman of the Orange County Republican Party. Frank's board experience includes being a founding member of the board of directors for Pacific Ethanol Inc. an Advisory Board member for Solis Capital Partners; a board member of the Bank of Hemet; and recently being appointed Chairman of the Board of United Fuel & Energy.
Under the leadership of Frank and his father Frank H. Greinke SC Fuels also has the distinction of being the first company from the United States to do business in the Republic of Georgia. In 1992 Southern Counties Oil opened the first western-style gas station in the capital city of Tbilisi just after Georgia became the first former Soviet Republic to become independent. Earlier this year Frank was appointed to the Republic of Georgia's Honorary Counsel for the west coast in the United States replacing his late father Frank H. Greinke.