Caspar René Gregory published a cataloging system for the Greek New Testament manuscripts in 1908. In 1963, Kurt Aland expanded Gregory's work, and the Gregory-Aland (GA) numbers became the industry standard for referencing Greek New Testament manuscripts.
Caspar René Gregory (1846–1917): Architect of Modern New Testament Manuscript Cataloguing and External-Documentary Methodology
Gregory built the stable numbering system for Greek New Testament manuscripts and modeled a documentary-first method anchored in early Alexandrian witnesses.
Ezra Abbot (1819–1884): Method, Manuscripts, and the Documentary Case for the New Testament Text
Ezra Abbot championed documentary evidence and early Alexandrian witnesses, shaping rigorous New Testament textual criticism that still guides editors and translators.

