Who wrote The Hitchhiker's Guide to the Galaxy?
I believe it was written by Douglas Adams, an English author.
Douglas Adams has written many books, right?
Yes, as well as other genres of writing. He is also an essayist and scriptwriter.
Did he ever work for television?
I think that he contributed here and there, yes. He was widely successful in a few mediums, but especially writing and The Hitchhiker's Guide.
The Guide was also adapted for radio and TV, correct?
Yes I believe that is true. It originally aired as a radio comedy.