On November 6, 2023, the Board of Directors of Advanced Emissions Solutions, Inc. appointed Stacia Hansen to previously succeed Morgan Fields as the Company?s Chief Accounting Officer effective November 6, 2023. Ms. Hansen will assume the responsibilities as the principal financial officer, which were filled by Ms. Fields. Ms. Fields will remain an employee of the Company until her employment with the Company terminates on December 21, 2023.

Ms. Hansen, 37, has more than 12 years of accounting experience and expertise in SEC reporting, technical accounting, and Sarbanes-Oxley Act compliance. Ms. Hansen has worked for the Company since 2015, holding the position of Manager of SEC Reporting and Technical Accounting from 2015 to 2019 and the position of Director of SEC Reporting and Technical Accounting since 2019. Prior to joining ADES, Ms. Hansen worked in Assurance Services at Ernst & Young, LLP from 2009 through 2015.

Ms. Hansen, a certified public accountant, graduated with a B.S. and a Master of Accountancy from the University of Denver.