MGA Insurance Group (MGA), acquired by Arthur J. Gallagher & Co. (AJG) in 2014 and renamed Gallagher Affinity, is an industry leader in association management, program administration and insurance benefits for more than 300 national associations and affinity groups. The firm now services more than 30 million members with a broad and customizable portfolio of professional liability insurance, health benefits, and other affinity products such as life, ancillary health, and business service discounts.