1 min readMargaret W. ‘Hap’ BrenneckeNASAMar 13, 2019 Image Article Portrait of Margaret W. “Hap’ Brennecke. Brennecke was a metallurgist and welding engineer in the Materials and Processes Laboratory at Marshall. Portrait of Margaret W. “Hap’ Brennecke. Brennecke was a metallurgist and welding engineer in the Materials and Processes Laboratory at Marshall. Image credit: NASA