Jack has had a long association with Dharma study and practice. He studied Pali language and Abhidhamma at the Post-Graduate Institute of Buddhist Studies in Nalanda, Bihar, and practiced meditation for several years in India with Anagarika Munindraji and Dipa Ma. He also studied with the Ven. Mahasi Sayadaw in Burma. He is co-author of Transformations of Consciousness (Shambhala, 1986), and is a clinical psychologist.