The "Allentown Art Gallery" was organized by Baum and opened in Allentown's Hunsicker School on March 17, 1934. With seventy canvases by local Pennsylvania impressionist artists on display, the gallery attracted major attention from the local and regional art communities. During the Great Depression, Baum was able to grow the collection through the Public Works of Art Project and through acquisitions and gifts. In June 1936, the City of Allentown granted the museum a permanent home in a Federal-style house located in the Rose Garden in Allentown's Cedar Park. The museum's first curator was local artist John E. Berninger, a student of Baum's, who lived with his wife on the museum's second floor.