In 1947 he started working for the Observatorio de Tacubaya of the UNAM
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Other major research projects carried out by Haro included the list of 8746 blue stars in the direction of the north galactic pole published jointly with W. J. Luyten in 1961.
Guillermo del Toro | Guillermo Dávila | Guillermo Arriaga | Guillermo Vilas | Guillermo Kuitca | Guillermo Francella | Guillermo Estévez Boero | María II Díaz de Haro | Haro | Guillermo Somoza | Guillermo Söhnlein | Guillermo José Garlatti | Guillermo Gómez-Peña | Guillermo Buitrago | Francisco de Haro | Teresa Díaz II de Haro | San Guillermo Parish Church | Melissa Haro | Juan Damián López de Haro | José Guillermo Rodríguez | Haro Strait | Gunnar Guillermo Nielsen | Guillermo Vecchio | Guillermo Thorndike | Guillermo Ruiz | Guillermo Rodríguez | Guillermo Rigondeaux | Guillermo Pérez Roldán | Guillermo Navarro | Guillermo Mota |