Breaking the centuries old tradition of secrecy surrounding the empowering science of Kundalini Yoga, he began teaching it publicly. With the yogic sciences of yoga, meditation, yogic philosophy, and loving acceptance, he gave the soon to be called "Baby Boomers" an effective alternative to the prevalent drug culture. He called it the "3HO" (healthy, happy, holy) way of life.

From humble beginnings, teaching first at the East West Cultural Center and then in a student's furniture store in West Hollywood, "The Yogi" was like a magnet. Students flocked to his classes. Soon he was teaching at colleges and universities, including Claremont and UCLA, and accepting invitations to teach in other cities.

In July of 1969 the non-profit 3HO Foundation (Healthy, Happy, Holy Organization) was incorporated in California. 3HO's service to humanity is through Kundalini Yoga, meditation and the Science of Humanology which improves physical well being, as well as deepening spiritual awareness.

Under his guidance as Director of Spiritual Education, 3HO mushroomed worldwide, to 300 centers in 35 countries. In 1994 3HO became a member of the United Nations as an NGO (Non-Governmental-Organization) in Consultative Status (Roster) with the Economic and Social Council, representing women's issues, promoting human rights and providing education in alternative systems of medicine.

A deeply devoted Sikh, his inspiration and example motivated thousands to embrace the Sikh way of life. Through his personal efforts, Sikh Dharma was officially recognized as a religion in the USA in 1971. In 1971, in acknowledgement of his extraordinary impact of spreading the universal message of Sikhism, the president of the SGPC (governing body of Sikh Temples in India), Sant Charan Singh called him the Siri Singh Sahib, Chief Religious and Administrative Authority for the Western Hemisphere, and he was given the responsibility to create a Sikh Ministry in the West by the Akal Takhat, the Sikh seat of religious authority in Amritsar, India. He was honored with the title Bhai Sahib by the Akal Takhat in 1974.

Traveling extensively in the seventies and eighties, Yogi Bhajan crusaded tirelessly to educate, uplift, and enlighten everyone he met. His basic message was "It is your birthright to be healthy, happy, and holy."

Over the years, the Siri Singh Sahib would say that all of his teachings came from the teachings of the Sikh Masters (Gurus). He was just sharing it in a language that his students could understand. Inspired and motivated by his words and adhering to the practices he taught, students created music, art, and poetry reflecting the universal wisdom inherent in these teachings. Over 200 books have been written based on his teachings of Kundalini Yoga and Sikh Dharma, as well as a wealth of CD's, videos, paintings, and sculpture. He himself wrote over 30 books including The Teachings of Yogi Bhajan, Furmaan Khalsa, Masters Touch, and Mind and Its 81 Facets.

Becoming the Mahan Tantric (only living Master of White Tantric Yoga) in 1971, he conducted workshops in cities around the world. In 1987 he transferred these workshops to videotape, calling them "Renew to be New" Courses, which continue to be held worldwide.