2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/36190This paper shows how to obtain the spinor field and dynamics from the vielbein and geometry of General Relativity. The spinor field is physically realized as an orthogonal transformation of the vielbein, and the spinor action enters as the requirement that the unit time form be the gradient of a scalar time field.12 pages, REVTEX, no figuresGeneral Relativity and Quantum Cosmologytext