Based on the provided information, here is a summary of Mantak Chia:
Mantak Chia is a Taoist master based in Thailand who teaches practices related to pranic living and breatharianism. His approach is framed within the Taoist tradition, specifically through a practice he refers to as "Pi Gu." This concept is described as a form of detoxification and is also associated with intermittent fasting and "eating the air."
Chia's teachings focus on the idea of "living on light/prana," suggesting that it is possible to nourish the body with energy from sources other than conventional food. He disseminates these concepts through various platforms, including online lectures, interviews, and retreats, where he instructs on these Taoist methods. The provided materials do not contain details on when he began these practices or any formal studies or observations of his methods.