Mr. de Cou has appeared as guest conductor with many leading orchestras, including those of Philadelphia, Chicago, Houston, Saint Louis, Detroit, Montreal, Boston Pops, Minnesota, Denver, Portland and San Francisco. He was acting music director for the San Francisco Ballet and conductor of the American Ballet Theatre for eight seasons conducting performances at Lincoln Center as well as national and international tours.
Mr. de Cou’s innovative concerts at the Wolf Trap Pavilion have included the first screenings of The Wizard of Oz with the score performed with live orchestra, the first ever live Twitter program notes (Beethoven Pastoral Symphony) and live in-time pod cast for a concert called "Fantastic Planet." In 2008 he conducted the first performance of Rodgers & Hammerstein at the Movies.
In 1985, de Cou was hired by Mikhail Baryshnikov to be the conductor of the American Ballet Theatre afterward joining the staff of the San Francisco Ballet where he ended his tenure there as music director in 1998. He has also worked with the New York City Ballet, National Ballet of Canada, Pacific Northwest Ballet and Suzanne Farrell Ballet and others.