In 2014, St.Clair assumes the position as music director of the National Symphony Orchestra in Costa Rica. His international career also has him conducting abroad several months a year, and he has appeared with orchestras throughout the world. He was the principal guest conductor of the Radio Sinfonieorchester Stuttgart from 1998 to 2004, where he completed a three–year recording project of the Villa–Lobos symphonies. He has also appeared with orchestras in Israel, Hong Kong, Japan, Australia, New Zealand and South America, and summer festivals worldwide.