Brian Hackler serves as a Principal at Cornerstone Government Affairs, representing clients across industries, including defense and national security, energy, life sciences, venture capital, and agriculture. Hackler served for 12 years on the staff of U.S. Sen. Jim Inhofe, including serving as Deputy Chief of Staff. He helped advance legislation addressing economic and scientific development, environmental regulation, defense, infrastructure, transportation, tax policy, and a range of other issues. Hackler served two combat deployments in Iraq as a member of the United States Marine Corps. He has a bachelor’s degree from the University of Central Oklahoma and a JD from the Oklahoma City University School of Law.