Harbhajan Singh Khalsa (born as Harbhajan Singh Puri) (August 26, 1929 – October 6, 2004), also known as Yogi Bhajan and Siri Singh Sahib to his followers, was an Indian-born-American yogi, spiritual teacher, and entrepreneur.
He introduced his version of Kundalini Yoga to the United States.
He was the spiritual director of the 3HO (Healthy, Happy, Holy Organization) Foundation, with over 300 centers in 35 countries.