To the Editor A recently published Viewpoint titled “Observations on the Discovery of Glucagon-Like Peptide-1 Action” was based on the authors’ personal recollections and contains statements that are inconsistent with the published and legal record, US patents (5,118,666; 5,120,712; 5,5614,492; 6,849,708; and 7,138,486 B2), and dated entries in my laboratory notebooks. My foundational research in this field predated the summer of 1984, when Dr Daniel Drucker, along with the Viewpoint authors, Drs Jacques Philippe and Alvin C. Powers, joined Dr Joel Habener’s Laboratory of Molecular Endocrinology at Massachusetts General Hospital (MGH).