Grenzebach Glier and Associates – GG+A | 11,158 followers on LinkedIn. GG+A is a full-service philanthropic management consulting firm with 60 years of industry-defining leadership in helping our clients realize the full potential of their missions through the growth of philanthropic support. Our primary mission is to assist our clients in the substantial improvement and acceleration of their fundraising programs. We seek to align those programs with the institution’s core mission and ensure their sustainability.