Demis Hassabis, who was a pretty strong junior in England about 15/20 years ago, is the subject of a programme about child prodigies on radio 4 in five minutes. As usual with radio 4 shows you can listen to it on their website after it has finished: http://www.bbc.co.uk/radio4/iwasachildprodigy/pip/pdss3/
If I recall correctly he gave up chess to become a computer games programmer.