In 1944 the school was purchased by Bertha Keller Mann and it ceased teaching the arts and became solely a private school teaching traditional academic subjects in grades K-12 to mostly children working in the entertainment business or competitive athletics in Los Angeles.
[1] For the Fall of 1924, bandmaster, clarinetist, and composer Albert Perfect joined the faculty of the school when it expanded its offering to include woodwinds and brass instruments.
[1] At the same time Modest Altschuler was a visiting lecturer at the institution, and Russian pianist Alexander Kosloff joined the piano faculty.
[5] German concert pianist and composer Georg Liebling was a member of the piano faculty in the early 1930s.
[6] The school presented numerous student recitals and productions during the 1920s and early 1930s, as well as hosting concerts given by established professionals.
[11][12][13][14][15] Martha O'Driscoll's mother was a financial partner in the Mar-Ken Professional Children's School.