Power of Attorney for Dwight W. Rettig

This filing is an Exhibit 24, a Power of Attorney granted by Dwight W. Rettig, Chief Administrative Officer, General Counsel, and Corporate Secretary of HMH Holding Inc., to Thomas W. McGee and Cindy Nichols. The attorneys-in-fact are authorized to prepare and execute necessary SEC filings, including Forms 3, 4, and 5, and any amendments, on behalf of Mr. Rettig. This includes obtaining electronic filing credentials, reporting Mr. Rettig's securities transactions and ownership in HMH Holding Inc., and gathering relevant information from third parties. The Power of Attorney remains effective until Mr. Rettig is no longer required to file these forms, or until revoked in writing, or until the attorneys-in-fact are no longer employed by the company. Mr. Rettig acknowledges that this does not relieve him of his compliance responsibilities under Section 16 of the Exchange Act.