Sonu Shamdasani is a London-based historian of psychology and Professor of Jung History at UCL's Health Humanities Centre for the History of Medicine. He is widely recognized as one of the foremost scholars of Carl Jung's life and unpublished work.

Shamdasani is best known for editing and annotating Jung's Liber Novus, published as The Red Book, the private journal in which Jung recorded his visions and active imagination experiments between 1913 and 1930. Long kept from publication by Jung's family, the Red Book is widely considered the seed from which Jung's later psychology grew. Shamdasani's scholarly introduction and notes made this foundational, previously inaccessible text available to the public for the first time in 2009.

In 2003, Shamdasani co-founded the Philemon Foundation with Stephen Martin, an organization dedicated to publishing Jung's remaining unpublished works, including The Black Books, Jung's original private journals that preceded the Red Book. He continues to serve as the foundation's General Editor.

Shamdasani's scholarship has fundamentally reshaped how the field understands Jung's intellectual development, revealing the deeply personal, visionary experience that underpinned concepts like the collective unconscious, individuation, and active imagination.