De Haro was born in Compostela, Nayarit, Mexico and came to San Francisco in 1819. He was the first Alcalde of Yerba Buena in 1834. He was instrumental in planning the street grid of the town along with Englishman William A. Richardson in 1835. In 1837, de Haro bought the Galindo ranch, which included Lake Merced and portions of northern San Mateo County, from the grantee José Antonio Galindo. And in strange turn of events, in 1838, Alcalde de Haro issued an arrest warrant for Jose Antonio Galindo for the murder of José Doroteo Peralta (1810–1838). De Haro served again as the fifth Alcalde from 1838-1839. He commissioned the first survey of the settlement by Jean Jacques Vioget in 1839.