 He moved to Texas in the mid-1830s, then spent "the next twelve to fifteen years" in Mexico.While in Guadalajara, he met Andrew A. Boyle, and the two returned to the United States — with Keller going at first to New Orleans, then to San Francisco in 1849 and finally to Los Angeles in 1851.Keller opened a general store at the corner of Los Angeles and Commercial streets and also purchased ten acres from Manuel Requena at Alameda and Aliso streets, where Union Station is now situated.