Advanced Emissions Solutions, Inc. announced that L. Heath Sampson notified the Board of Directors of ADES that he plans to resign as Chief Executive Officer (CEO) effective June 30, 2020 to pursue other interests. On March 27, 2020, the Board appointed Greg P. Marken, the Company's current Chief Financial Officer, Treasurer and Secretary as interim President and Chief Executive Officer, effective as of July 1, 2020, upon successful completion of an orderly transition process.