Dora Kalff (1904–1990) was a Swiss Jungian therapist who developed Sandplay Therapy, a powerful non-verbal therapeutic method that helps both children and adults access their inner world. 

A student of Carl Jung, Kalff was encouraged by him to develop a method that could help children express their unconscious.

She studied in London with Margaret Lowenfeld, whose "World Technique" served as the primary foundation for her work.

Kalff uniquely integrated principles from Eastern philosophy, particularly Zen and Tibetan Buddhism, which informed her focus on the therapist's role as a "silent witness".

 In 1985, she founded the International Society for Sandplay Therapy (ISST) to preserve and spread her teachings worldwide