Mark van Tongeren is a sound explorer and vocal performer working at the intersection of art and science. In his artistic work he emphasises performance/theatrical aspects of music and collaborates with improvisers, composers as well as dancers and visual artists. His ethnomusicologal work focuses on the music of South-Siberia, Mongolia and Tibet. His book+CD Overtone Singing covers many aspects of this singing technique. As an artistic researcher he received a PhD from Leiden University with his thesis Thresholds of the Audible and the performance Incognito Ergo Sum. He has taught independently and at universities in and outside of Taiwan, where he lives.