In 1968, after arguing some of the most high profile cases of the day as a federal prosecutor for the Eastern District of Wisconsin, Franklyn M. Gimbel founded his own law firm. Frank's late brother, Stanley P. Gimbel, joined the firm in 1969, followed shortly thereafter by former federal prosecutors Richard E. Reilly and Thomas E. Brown, and former Wisconsin Department of Justice Special Agent D. Michael Guerin. In the mid-1980s Denis J. Regan came aboard developing the firm's business law, real estate and estate planning practices. A few years later Kathryn A. Keppel, Patrick J. Knight, and Raymond M. Dall'Osto brought their appellate, litigation and trial experience to the firm. GRGB continues to grow, adding Christopher L. Strohbehn, Erin M. Patterson and Steven C. McGaver in the 2000s.

Today, almost forty years later, GRGB is recognized as one of the best trial firms in the State of Wisconsin. The firm has successfully represented individuals and businesses in a wide variety of cases, including business litigation, business transactions, civil litigation, criminal law, estate planning, family law, health care/nursing home litigation, personal injury, probate, product liability litigation, and real estate law. The firm's successes have resulted in referrals from other lawyers and professionals, both in Wisconsin and in other states, who recognize the expertise and unique skills of the firm's attorneys.

The firm's lawyers also dedicate substantial time and effort to professional and charitable pursuits. Through the years, GRGB attorneys have served as president of the State Bar of Wisconsin, president of the Milwaukee Bar Association, Chairman of the Board of the Wisconsin Center District, and officers and directors of the ALS Association - Wisconsin Chapter.

GRGB is truly a full-service law firm, encompassing the experience, reputation, and capabilities of a large law firm while maintaining the personalized service which its clients expect and deserve.