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Westminster originated in 1951 as a reorganization of Atlanta's North Avenue Presbyterian School (NAPS), a girls' school and an affiliate of the North Avenue Presbyterian Church. Dr. William L. Pressly of Chattanooga, Tennessee's McCallie School served as Westminster's first president. The school moved to its current campus in 1953 as the result of a land grant by trustee Fritz Orr.
Also in 1953, Washington Seminary, another private school for girls, founded by two of George Washington's great-nieces in 1878, merged with Westminster. The resulting school was co-educational until the sixth grade, with separate schools for boys and girls continuing through the twelfth grade, a practice that continued until 1986 and provided the basis of Westminster's plural name.
In the mid-1950s, Westminster became a test site for a new advanced studies program that would later become the College Board's Advanced Placement program. In 1962, the administration building, later named Pressly Hall, was constructed, bringing the number of permanent buildings on campus to four.
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