Johan van Kreij (*1969) is a performer and composer of electronic music. In 1998 he graduated from the Institute of Sonology, where he started developing his own electronic musical instruments. He develops both the hardware and software: sensors and other equipment form the gestural part of these instruments, while the sounding part of the instruments consists of software that employs a wide range of sound synthesis models. The instruments are used in the performance of contemporary music, dance and theatre. Johan van Kreij has taught at the Institute of Sonology since 2001.