Theosophical Society in America (TSA) – National Organization
The T
heosophical Society was founded in late 1875, in New York City, by Russian noblewoman Helena Petrovna Blavatsky and American Colonel Henry Steel Olcott, along with attorney William Quan Judge and those interested in the philosophy.
Mada
me Blavatsky, a seer, traveled in search of spiritual wisdom. She brought Buddhism, Hinduism and ancient Western mysteries to the West and her writings became the base of modern Theosophy. Colonel Olcott, a Civil War veteran, lawyer and journalist, became the first President of the Society. Olcott bridged the timeless wisdom of Theosophy to everyday life and built an international organization.
Blavatsky and Olcott, established in 1882 the Society’s Intern
ational Headquarters in Adyar, India. While in Sri Lanka, Olcott promoted social welfare for oppressed Buddhists; and is still a national hero.
William Quan Judge advanced Theosophy in the United States to 102 branches with six thousand members in 1895.
English reformer Annie Besant reviewed Blavatsy’s book, and joined the Theosophists. In August 1890, Blavatsky moved in to Besant’s home in St. John’s Wood and appointed Besant the new head of the Blavatsky Lodge in Europe. Madame Blavatsky died in 1891, leaving Col. Olcott and Annie Besant as leaders of the international movement in Adyar, and WQ Judge heading the vital American Section.
In 1895, 
eighty-three lodges of the American Section, voted for autonomy from the international Theosophical Society in Adyar. Five American lodges kept their affiliation and, formed a new “American Theosophical Society (ATS),” under Alexander Fullerton. Lectures by Annie Besant and Constance Wachtmeister built new interest. By 1900 the organization claimed 1286 members in 71 branches. The “ATS” was renamed “The Theosophical Society in America” (TSA) in 1934.
The American 
center of the TSA (called “Olcott” in honor of the President-Founder) in Wheaton, Illinois leads about 110 local groups and affiliated members- at-large who carry on active Theosophical work. Like other Theosophical groups, the TSA aspires to teach the principles of Theosophy through publishing, public programs, and local groups.
From the TSA About Theosophy https://www.theosophical.org/the-society
Books by Helena Blavatsky
Isis Unveiled: (A Master Key to the Mysteries of Ancient and Modern Science and Theology),two volumes (“Science” and “Theology”)1877.
From the Caves and Jungles of Hindostan, 1880.
The Secret Doctrine: (The Synthesis of Science, Religion, and Philosophy), two volumes (“Cosmogenesis” and “Anthropogenesis”) 1888.
The Key to Theosophy: (A Clear Exposition, in Question and Answer, of the Ethics, Science, and Philosophy of Theosophy),1889.
The Voice of the Silence: (From the Book of the Golden Precepts, for the daily use of Lanoos (Disciples), translated and annotated by “H.P.B.”) including the Stanzas of Dzyan,
1889.
Theosophical Glossary 1892.
Nightmare Tales, 1892.
Transactions of the Blavatsky Lodge: (Compilation of essays from Lodge Journals).
