Thomas Grossnicklaus

Of Counsel

Thomas Grossnicklaus is a seasoned leader with a distinguished record of service in the public, private, and military sectors. A Marine Corps veteran, Thomas served five years, including deployments to Guantanamo Bay Cuba, Yemen, and the middle east where he led his unit as the Section Leader for the Designated Marksmen during high-intensity embassy recapture and security operations throughout the middle east.

Following his military service, Thomas earned his degree in Political Science from Oklahoma City University. While completing his undergraduate studies, he worked for Congressman Steve Russell in both the district office and on a successful re-election campaign. He went on to attend OCU Law School, where he gained additional public sector experience working in the Office of Governor Mary Fallin and later clerking for Oklahoma Supreme Court Justice Jim Winchester.

Thomas has held multiple senior leadership roles across state government, including serving for several Oklahoma Attorneys General, where he represented multiple state agencies and boards.

After his time at the Attorney General’s Office, he served as Chief of Staff and General Counsel at the Oklahoma Department of Commerce and also as the agency’s Acting Executive Director. There, he oversaw a $646 million deployed budget, authored major economic development legislation—including the Perform Act and Five Major Sports Leagues Act—and helped structure incentive packages for some of the largest business investments in Oklahoma’s history, resulting in substantial job creation and capital growth.

Thomas returned to the Oklahoma Attorney General’s Office and served on the senior leadership team and worked on special projects and was the Deputy Attorney General over the Utility Regulation Unit. In that role, he was statutorily responsible for representing all ratepayers before the Oklahoma Corporation Commission. He oversaw rate cases with electric and gas companies. He helped develop Oklahoma’s new tariff for large loads.

Thomas has extensive experience in all areas of general corporate and business law with particular emphasis in mergers, acquisitions and divestitures, real estate, oil and gas, and banking transactions.