I think Stephen King is always writing horror, whatever the audience. Actually, I think a lot of authors branch out into children's books, because they're short and they've already got name recognition, but aren't necessarily writing something "different," just modulating their tone and vocabulary.

You'll find the damnedest names on a children's library shelf (John Lithgow, who is quite good, and also Fred Gwynn, who played Hermann Munster).

Fred Gwynn, who played Hermann Munster

We have one of those -- The King Who Rained.

Actually, I think a lot of authors branch out into children's books, because they're short and they've already got name recognition, but aren't necessarily writing something "different," just modulating their tone and vocabulary.

That's why I hesitate to mention Chabon. I want people who are writing adult and children's book simultaneously (like Joan Aiken), not who used their name recognition as a platform to write stuff they might consider more fun.

I thought she did. Oh, well, I didn't really think of that, AmyLiz. No, not quite like "Wifey" and "Superfudge" Which are both funny, on completely different planets.

You'll find the damnedest names on a children's library shelf (John Lithgow, who is quite good,

It was very surreal to find out that he was at IRA this year as a keynote speaker because of some children's books he wrote. Well, "wrote," anyway.

You'll find the damnedest names on a children's library shelf

Also Julie Andrews, who writes kids books under her married name of Julie Andrews Edwards.

There are those romance authors who have moved onto the mainstream fiction and mystery shelves, including Iris Johansen, Sandra Brown, and Janet Evanovitch.

Madeleine L'Engle -- young adult and adult books Kate Wilhelm -- science fiction, literary fiction, mysteries

Then there are the examples of people who wrote one "science fiction" book and who really, really shouldn't have, e.g. P.D. James.

Ooh, good calls, Ginger!

Although, I kind of liked The Children of Men.

::ducks and runs::

I think Scott Westerfeld wrote five adult books before moving to young adult/juvenile fiction. Anyway, some of his books are shelved with the adult sf in my library, and the others are with the YA stuff. In his FAQ, he discusses why he's been writing a lot of teen stuff lately. [link]

Emma Bull wrote a YA book (The Princess and the Lord of Night), as well as her adult fantasy and sf.

Georgette Heyer wrote contemporary mysteries, historical romances (regency but also georgian), 'straight' historical fiction, and 'straight' contemporary novels.

I didn't know that about Heyer, but then I am largely Heyer-clueless. Cool. Another good example.