(21 September 1866 – 13 August 1946)
The most important 19th century SF writer, H. G. Wells can rightfully be called the grandfather of SF (Hugo Gernsback, is uncle, of course). During the course of his writing career, he greatly influenced the field with seminal stories such as The Invisible Man, The Time Machine, and /The War of the Worlds. He had no connection with fandom other than his influence on the genre, and, in fact, his most important works were written early in his career before sf was recognized as such — his later life was more focused on utopian theorizing.
For more on his career, see http://www.sf-encyclopedia.com/entry/wells_h_g