 In 1931, in Berlin, she gave the premiere of the Cello Sonata by John Foulds.While at the University of Washington, Heinitz was an excellent (and patient) teacher who introduced young Americans to the joys of early music and the viola da gamba.In 1964 she took on a group of students from Dr. Wallace Goleeke's Ingraham High School Madrigal Singers, teaching them to play in a viol ensemble of soprano, alto, tenor, and bass Renaissance instruments.