Helena Roerich (1879–1955) was a prominent Russian thinker, enthusiast and writer whose artistic heritage represents a very distinctive phenomenon in Russian and global scientific and philosophical thought. The principal work of her life – the books on the Living Ethics, dedicated to the issues of the cosmic evolution of the mankind, and her epistolary work, closely related to her books, laid a firm foundation for many cultural and spiritual movements that were developing in the 20th century.