Ammonia and hydrogen gas turbine engines have emerged as promising solutions to reduce greenhouse gas emissions in power generation applications. Although each fuel poses challenges to combustion and NOx (nitrogen oxide) emissions, computer simulations of the combustion processes can be used to find optimal combustion chamber conditions and NOx mitigation strategies. However, the underlying chemistry, or chemical kinetics, must be correct for the simulation to be accurate. Current nitrogen-based reaction mechanisms still need high-pressure experimental validation. Through fundamental studies, such as shock tube ignition delay times, spherical combustion chamber laminar burning velocities, and laser absorption speciation measurements, ammonia and hydrogen chemistry can be properly validated for use in gas turbines.