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Sidney Harris, a.k.a. S. Harris, is an American cartoonist who draws cartoons about science, mathematics, and technology. He was born in Brooklyn, New York, on May 8, 1933, and has been drawing science-related cartoons since 1955. His cartoons have appeared in the scientific journals, science fiction magazines and textbooks. He was elected as the 19th honorary member of Sigma Xi, a scientific honor society, in 1997. Harris obtained his degree from Brooklyn College and then attended the Art Students League in New York. He began his career as a science cartoonist in 1955. Over 600 of Harris' drawings have been published by American Scientist since the 1970s. Harris also has had more than 20 cartoon collections published.

Hartmann was an associate of Helena Blavatsky and was Chairman of the Board of Control of the Theosophical Society Adyar. He collaborated with the mystic Carl Kellner. He published the journals Lotusblüthen (1893-1900) and Neue Lotusblüten (1908-1913). He wrote articles on yoga and popularized the subject within Germany.He has been described as "one of the most important theosophical writers of his time". His works include several books on esoteric studies and biographies of Jakob Böhme and Paracelsus. He translated the Bhagavad Gita into German and was the editor of the journal Lotusblüten. He was at one time a co-worker of Helena Blavatsky at Adyar. In 1896 he founded a German Theosophical Society. He also supported the Guido-von-List-Society (Guido-von-List-Gesellschaft).