The book "The Indian Science of Breathing: Yogic and Tantric Practices" is written by William Walker Atkinson, who is known for his research on Eastern philosophies and practices. In this book, the author examines the impact of breathing on physical and mental health, as well as on the spiritual development of a person. It explores the breathing techniques used by yogis and tantrics to achieve harmony of body, mind and soul. The book is a valuable source of information on the ancient teachings of breath control and its impact on human life.