Gary O’Toole is a professional Vedic astrologer, teacher, and author with over three decades of study and practice in Jyotiṣa. He is the author of several works on Vedic astrology, including studies on planetary periods, and is the founder of Timeline Astrology, a platform dedicated to research, teaching, and publication in the field of Jyotiṣa. He teaches internationally and has developed structured courses exploring daśās and integrative interpretive methods. His website is timelineastrology.com.