The Harker School is a private, co-educational, non-profit school in San Jose, California. Founded in 1893 as Manzanita Hall by Frank Cramer in Palo Alto, Harker now has four campuses: Union, Bucknall, Blackford, and Saratoga, named after the streets on which they lie. The Union campus houses the Preschool, the Bucknall campus houses the Lower School (Kindergarten through grade 5), the Blackford campus houses the Middle School (grades 6 through 8), and the Saratoga campus houses the High School (grades 9 through 12).