Theosophy is a philosophical and spiritual movement that was founded in the late 19th century by
Helena Petrovna Blavatsky ,
Henry Steel Olcott , and others. Theosophy is derived from the Greek words ‘theos’ (God) and ‘sophia’ (wisdom), and it seeks to uncover the underlying spiritual principles that are believed to exist behind all religions and philosophies. 
Rudolf Steiner initially became involved with the
Theosophical Society in the early 20th century, and he quickly rose to become one of its leading figures. However, Steiner’s views diverged significantly from those of the Society’s leadership, particularly with regard to his emphasis on individual spiritual development and his rejection of the Society’s hierarchical structure.
Steiner eventually founded his own organization, the
Anthroposophical Society , which promoted his own unique spiritual teachings and practices. This led to his expulsion from the Theosophical Society in 1913.
Theosophy- An Introduction to the Spiritual Processes in Human Life and in the Cosmos , published in 1904, was Steiner’s first major work on Theosophical ideas.
It explores the nature of the human being, the spiritual realms, and the processes of reincarnation and karma.
Rudolf Steiner (1861-1925) was an Austrian philosopher, social reformer, and spiritual teacher who founded the spiritual movement known as
Anthroposophy . Steiner was born in what is now Croatia and grew up in Austria. He studied science, mathematics, and philosophy at university, and later became a noted literary critic and writer.