2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/132297This article contains lecture notes on the constrained path Monte Carlo method and its applications to study the Hubbard model. The lectures were given at the NATO Advanced Summer Institute held in Ithaca NY (1998). The article is published as a chapter in the book `Quantum Monte Carlo Methods in Physics and Chemistry,' Ed. M.P. Nightingale and C.J. Umrigar (Kluwer Academic Publishers, 1999).26 pages; latex with 1 sty file includedCondensed Mattertext