2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/144469These are my personal impressions of the environment in which string theory was born, and what the important developments affecting my work were during the hadronic string era, 1968-1974. I discuss my motivations and concerns at the time, particularly in my work on loop amplitudes and on closed strings.Invited Contribution to "The Birth of String Theory" Commemorative Volume. 12 pages, 2 figures. Minor content revisionHigh Energy Physics - Theorytext