Barbara Brennan

Her first book, Hands of Light: A Guide to Healing Through the Human Energy Field, is considered a "classic" in the field of spiritual healing, with reputedly over one million copies in print in 22 languages. Brennan claimed to receive intuitive information about her clients during sessions, and to see repetitive patterns in the energy fields of her clients indicating common roots underlying their difficulties. Brennan's books contain drawings of auras and energy fields, and descriptions of how human energy fields interact with each other. She popularized a seven-layer model of the energy field, each layer being structured of differing frequencies and kinds of energy and performing different functions.[citation needed] Brennan viewed the chakras as transformers that receive and process universal energy, as well as enabling expression and healthy functioning of the individual's own consciousness and psycho-physical make-up. She was best known for taking a methodical approach to energy healing.

Brennan created a type of energy healing techniques that she called "full spectrum healing" to work on the seven layers of the human energy field or auras. Brennan claimed that the technique she called spiritual surgery works on the fifth level of the human energy field using the power of a spirit surgeon.

In 1982, she closed her private practice in New York City and established the Barbara Brennan School of Healing (BBSH), designed to train professional healers from around the world. The school has been located in Florida since 2000, and is licensed by the State of Florida Commission for Independent Education. In 2003, Brennan opened the Barbara Brennan School of Healing Europe (BBSHE), originally in Mondsee, Austria which then moved to Bad Neuenahr near Bonn, Germany in 2006 and moved back to Austria to the small town of Bad Ischl in 2008. BBSHE closed in 2015. In 2007, a new branch opened in Tokyo, Japan, which subsequently closed in 2010. Barbara Brennan School has 2700 graduates worldwide, over 224 teachers, and 188 Brennan Integration Practitioners. Brennan Healing Science Professionals continue to teach her work in Florida with plans of a global expansion in the near future. The Barbara Brennan School of Healing offers both a nonaccredited BA degree in Brennan Healing Science and a Brennan Healing Science certificate.