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The Montessori School of San Antonio was founded as the Judson School – a Montessori Workshop in 1974 by Gay and Jim Judson. That year, 18 Primary level students (aged 3 to 6) attended classes in space leased from Asbury United Methodist Church on San Pedro Avenue. After the school expanded to three sections of Primary students, it began to serve older children as well, adding its first section of Lower Elementary in 1981 and Upper Elementary in 1985. Pressed for space, in 1986 the rapidly-expanding school found a new home at 705 Trafalgar, the current location of the Alamo Heights Tennis Center. That same year the school added its first Middle School class.