Dr. Brian Weiss is an American psychiatrist and author, best known for his work in the field of past-life regression therapy. He gained widespread recognition with his book, *Many Lives, Many Masters*, published in 1988, which details his experiences with patients who recalled past lives during therapy sessions. His approach combines traditional psychotherapy with spiritual concepts, aiming to help individuals understand their current life challenges through insights gained from previous existences. In addition to his writing, Dr. Weiss conducts workshops and seminars worldwide, sharing his techniques and insights on healing and personal growth. He has authored several other books, including *Only Love Is Real* and *Messages from the Masters*, further exploring themes of reincarnation and the soul's journey. His work has influenced many in the fields of psychology and spirituality, bridging the gap between science and metaphysical beliefs.