In 1926 Tolkien met C.S Lewis and they became good friends. Tolkien's arguments brought Lewis to believe in God. Tolkien and Lewis were in a group called "the Inklings". These men all encouraged Tolkien to keep writing his books "The Silmarillion" and "The Lord of the Rings".
When Tolkien was 32 he became a professor of Anglo-Saxon at Oxford University. Tolkien had learned a lot of languages including Latin, French and German that he learned from his mom, and also Spanish, Greek, Italian, Dutch and a lot more. Later on Tolkien invented a language of his own that he called Quenya (or High-Elvish or Elf-Latin).
In 1937 The Hobbit was published and was very popular with both children (who it was intended for) and adults. Tolkien wanted to finish The Silmarillion but got caught up in the war of the ring. He spent ten years working on The Lord of the Rings and got a lot of support from the Inklings. The Lord of the Rings was soon published and also very popular. This was made for children at first, but became more serious and more for adult readers than children.
Edith died in 1971. Tolkien had his son Christopher Tolkien finish the Silmarillion. J.R.R Tolkien died in 1973. A few years later, in 1977, the Silmarillion was published by Christopher Tolkien. To this day Tolkien's books are some of the most well known works of literature in the world.
Read more about J.R.R Tolkien on wikipedia.