This is to certify that Dr. Ahmad Rafiq El-Tahan served as a researcher and manuscript editor at the Center for Heritage Research under the General Egyptian Book Organization (GEBO).

His responsibilities included the codicological and historical authentication of Arabic manuscripts, verification of authorship and content integrity, separation of interpolations from core texts, and preparation of scholarly critical editions for publication.
His contributions were marked by academic rigor and deep expertise in classical Arabic literary and manuscript traditions.