Stephen Robert is a seasoned financial executive who holds a degree in political science from Brown University. After retiring from his role as chairman and CEO of Oppenheimer Group, Inc., he is now dedicated to philanthropic endeavors. Through his efforts, Stephen K. Robert is creating a lasting legacy that will bring positive change and benefit to countless individuals and communities in need, particularly through the Source of Hope Foundation.

Source of Hope Foundation supports Polyphony, an integrated social movement in Israel that promotes friendship and collaboration between Palestinian-Israeli and Arab-Israeli communities through music. Polyphony also aims to demonstrate to the world that collaboration between different cultures is achievable and beneficial.

Jewish-Israeli and Palestinian-Israeli students enroll in Polyphony music programs that train participants for advanced career pursuits in music and international competitions. Through Polyphony's music appreciation program, Alhan, students connect with Arab and Jewish educators across Israel for training sessions. In 2017, Polyphony reached out to 237 elementary schools and kindergartens to help these learning environments incorporate Alhan into their programs. Consequently, over 10,000 students in Israel have gained access to the program.

Polyphony's scholars have performed at numerous events around the world. Some notable events are the Henry A. Kissinger Prize Ceremony in Berlin, the Kennedy Center in Washington, D.C., the Incontri di Siena Music Festival in Tuscany, Italy, and the Lincoln Center Global Exchange in New York City.