Greinke has been an active leader in the Tustin community for over a quarter of a century. Some highlights of her involvement include being chairman of Tustin ‘s citywide 60th Anniversary Celebration (which included a dinner serving 5,000, quilt show, El Camino Real Chili Cook-off and various other contests), president of the Tustin Area Historical Society and active involvement in the Tustin Lions Club, Tustin Chamber of Commerce, Tustin Women in Chamber of Commerce and the John Tracy Guild.
She is the 1986 Tustin Area Woman of the Year. “God has blessed me so abundantly; I feel the need to share those blessings by giving my time and energies to my communities of Tustin and Orange,” she shared.
With her husband Frank, who is a former Tustin mayor, they founded the Greinke Petroleum Corp. in Tustin. Later, as the company grew, it was renamed Southern Counties Oil Co. Margaret served as secretary-treasurer for 20 years and became chairman of the board in 1991. Born and raised in Los Angeles, Margaret has lived in Orange County since 1965.