A year later, after their marriage in America on Joel's 27th birthday in 1960, the young pianists were invited to play together at a festival in California.

[2] In 1962, the duo won the Harriet Cohen International Music Award for their London debut, in a program largely devoted to works by Schubert for four hands.

In 1966, they performed the Mozart Double Piano Concerto under the baton of Yehudi Menuhin in Gstaad, Switzerland and other venues in Europe.

During their annual tours in America and Europe, they gave many charity performances, for such organizations as the Swiss Technical Overseas Relief, for mental hospitals, needy infants in Germany, the World Day of Peace at the Lausanne Swiss National Exposition, and for the opening of United Nations Week in London.

During the following years, strongly supported by Yaltah, he studied psychology in Switzerland with the founder of Sandplay therapy, Dora M. Kalff, and he became a highly regarded Jungian psychotherapist.