Leonard Orr (born circa 1938) is an American spiritual leader best known for developing rebirthing-breathwork, a 'system' or technique of breathing that can help one to overcome the "trauma" of being born. Leonard claims to have met twelve immortal yogis, including Babaji or Herakhan Baba, the Mahavatar of the Kriya Yoga lineage [brought to the West by Paramahansa Yogananda, author of Autobiography of a Yogi and founder of the Self-Realization Fellowship. Many people within value the tool of rebirthing, yet his idea of physical immortality has not gained wide spread acceptance. He is also one of the earlier proponents of "prosperity consciousness" the idea that the state of one's mind, and beliefs about oneself are a key factor in "manifesting" more money. Perhaps his most controversial idea is the pheonomena he calls "emotional energy polution," in which other people's "death urge" and "unconsciousnees" can infect someone who is more spiritually pure. Leonard claims that when he spends too much time around less evolved people, that he oftentimes feels drained, depressed and sometimes even suicidal, from having absorbed their negative energy.