Before founding Hawthorne, Marc served as Senior Reservoir Engineer and engineering lead at Three Rivers Operating Company III LLC. In this role, he oversaw engineering evaluations, acquisition underwriting, and supported post-acquisition development and strategy.

Marc began his career at Pioneer Natural Resources, where he progressed through roles of increasing responsibility in reserves, production, and completions engineering across the U.S., including serving as Area Team Lead for the Sinochem Permian Basin and Reliance Eagle Ford joint ventures. Marc grew up in Midland, Texas and received a Bachelor of Science in Mechanical Engineering from the University of Texas at Austin.