Power of Attorney for Karl Erik Kjelstad

This filing is an Exhibit 24, a Power of Attorney document for Karl Erik Kjelstad, who is a director at HMH Holding Inc. The document, dated August 28, 2024, appoints Thomas W. McGee, Dwight W. Rettig, and Cindy Nichols as attorneys-in-fact. These attorneys are authorized to prepare and execute necessary SEC filings, including Forms 3, 4, and 5, on behalf of Mr. Kjelstad. This authorization is crucial for compliance with Section 16 of the Securities Exchange Act of 1934, related to beneficial ownership reporting. The power of attorney remains effective until Mr. Kjelstad is no longer required to file these forms, or until revoked. The filing also clarifies that the attorneys-in-fact are not assuming Mr. Kjelstad's compliance responsibilities.