This comprehensive collection of scholarly essays on the history and theology of the Siddha Yoga path explores its origin, development, philosophy and culture, and practices. The volume includes a history of the Siddha Yoga path in the 20th century and essays on the Siddha, the Guru-disciple relationship, the canons of Siddha Yoga, the Self, Shaktipat, Kundalini, and the ashram. Also included are extensive endnotes, references, and appendices documenting Siddha Yoga history.