Mogrelia had accepted a new position as music director of the San Francisco Conservatory of Music Orchestra in early March, and had originally planned to hold both jobs. No explanation for his change of heart has been given, although a recent statement released by the company said that he "will be returning to a more active schedule of international guest conductor engagements and recording projects."

Mogrelia came to the San Francisco Ballet in 2003, when he replaced Denis de Coteau, who had retired after 30 years with the company. At the San Francisco Conservatory, he replaces Alasdair Neale, who becomes the orchestra's principal guest conductor.

Helgi Tomasson, the company's artistic director, said, "Andrew has brought a vitality and extraordinary standard of excellence to our ballet orchestra for the past two years. I have enjoyed working with him and greatly appreciate his musical expertise and integrity."