Royal Conservatory of The Hague
From 1991 until 1998 Hirs studied composition at the Royal Conservatory of The Hague: from 1991 until 1994 with Diderik Wagenaar, from 1994 until 1998 with Louis Andriessen, occasionally taking additional composition lessons with Gilius van Bergeijk and Clarence Barlow. She holds a Master of Music degree from the Royal Conservatory of The Hague.