P. G. Wodehouse was a writer from Earth.
History
The Doctor and Nyssa met him during their travels. (AUDIO: Autumn)
References
While on Avalon, Barbara Wright reminisced about being curled up in bed with a mug of cocoa and reading a treasured book, such as one by Wodehouse. (PROSE: The Sorcerer's Apprentice)
The Fourth Doctor was a fan of his works, and stated that he would prefer an infinite number of monkeys produce the complete works of Wodehouse, over Shakespeare. (AUDIO: The Eternal Battle)
The Tenth Doctor had a P. G. Wodehouse book in his pocket around the time of his trial by the Shadow Proclamation. (COMIC: Fugitive)
Behind the scenes
Stephen Fry starred as Jeeves, and Mary Wimbush as Aunt Agatha in Jeeves and Wooster, a TV series based on characters created by Wodehouse.
The Fourth Doctor Adventures story, The Auntie Matter, was heavily influenced by Wodehouse's works, with several characters -particularly Grenville, Reginald and Ligeia Bassett clearly based on Wodehouse's characters (in this case, Jeeves, Bertie Wooster and Aunt Agatha respectively).