Rosemary L. Klein serves as Senior Vice President, Chief Legal Officer, and Corporate Secretary at CORE NATURAL RESOURCES INC., where she leads the company's global legal strategy, ensures compliance with complex regulatory frameworks in the natural resources sector, and manages corporate governance as secretary to the board of directors and shareholders. With more than 25 years of experience in energy and mining law, Rosemary plays a critical role in mitigating risks, structuring strategic transactions, and fostering sustainable business practices amid evolving environmental and geopolitical challenges. A graduate of Yale Law School, where she earned her Juris Doctor cum laude, Rosemary began her career at Skadden, Arps, Slate, Meagher & Flom LLP in New York, advising on high-stakes mergers, acquisitions, and project financings for major oil, gas, and mining clients. She later advanced to General Counsel positions at prominent firms including Rio Tinto and a leading midstream energy company, where she spearheaded international arbitrations, navigated SEC disclosures, and developed innovative ESG compliance programs that reduced litigation exposure by over 40%. Since joining CORE NATURAL RESOURCES INC. in 2018, Rosemary has driven transformative achievements, including the successful negotiation of multibillion-dollar joint ventures for critical mineral extraction, defense of key environmental permitting disputes, and implementation of a robust corporate ethics framework. Her strategic foresight has positioned the company as a leader in responsible resource development, earning her accolades such as "Top Women in Energy Law" by Law360 and board memberships at industry associations focused on sustainable mining.