Power of Attorney for Daniel Wayne Rabun

This filing includes a Power of Attorney document granted by Daniel Wayne Rabun, a director of HMH Holding Inc., to Thomas W. McGee, Dwight W. Rettig, and Cindy Nichols. This authorization allows the appointed attorneys-in-fact to execute and file necessary SEC forms, including Forms 3, 4, and 5, on behalf of Mr. Rabun. These forms are related to his reporting obligations under Section 16(a) of the Securities Exchange Act of 1934, concerning his ownership, acquisition, or disposition of the company's securities. The power of attorney also grants the attorneys-in-fact the ability to obtain information about transactions in the company's securities from third parties and to take any other actions deemed beneficial or legally required. The document specifies that the power of attorney remains in effect until Mr. Rabun is no longer required to file these forms, or until it is revoked in writing, or if the appointed attorneys-in-fact are no longer employed by the company or its affiliates. The filing is dated August 22, 2024.