Since the group's founding in 1961, GG+A has provided philanthropic consulting services to more than 2,000 nonprofits in five arenas: higher education, independent schools, academic medicine and healthcare, arts and culture, and the voluntary sector. The group's current clients are engaged in fundraising campaigns with a total value of nearly $60 billion. Individual client goals range from $5 million to more than $6 billion, demonstrating the firm’s commitment to serving nonprofits of all sizes.

The group's vision is to be the first-choice partner globally for nonprofits seeking substantial and sustainable growth in outreach and engagement, and in the philanthropic support of their missions.