Power of Attorney Appointment

This filing details a Power of Attorney granted by Lance Loeffler, a director of HMH Holding Inc., to Thomas W. McGee, Dwight W. Rettig, and Cindy Nichols. The attorneys-in-fact are authorized to prepare and execute necessary SEC filings, including Forms 3, 4, and 5, on behalf of Mr. Loeffler. This authorization covers all actions required for electronic filing, information gathering regarding company securities, and any other necessary steps to comply with Section 16 of the Securities Exchange Act of 1934. The power of attorney remains effective until Mr. Loeffler is no longer required to file, revokes it in writing, or the appointed attorneys-in-fact are no longer affiliated with the company. The document was executed on August 20, 2024.