François Jollivet-Castelot (1881-1938) was a French chemist, occultist, and writer, renowned for his works on alchemy and the mystical traditions of the Western esoteric tradition. A key figure in the early 20th-century revival of alchemical thought, Jollivet-Castelot's writings combine a scientific approach with a deep understanding of spiritual symbolism and hidden knowledge. His most influential works, such as The Alchemical Tradition and The Secret of the Philosophers' Stone, explore the intersection of alchemy, spirituality, and personal transformation. Jollivet-Castelot's unique ability to bridge the gap between science and mysticism has earned him a devoted following among esoteric scholars and spiritual seekers. His legacy continues to inspire those interested in unlocking the hidden mysteries of the alchemical path and the transformative power of esoteric wisdom.