aster regularly teaches masterclasses in operatic role study and dramatic interpretation in many opera studios and conservatories around the world . she also sits on the juries of numerous international voice competitions. since 2001 she has been general director of la roche d'hys - domaine des arts, an international centre for cultural encounters and professional development in burgundy, france. its programmes include workshops, masterclasses, seminars, exhibitions, conferences, and artists' residency retreats in all the arts disciplines as well as the presentation of concerts, theatrical and literary events.