Margaret Atwood is one of the most celebrated authors of fiction - having won the Booker Prize once, the Governor Genera's Award twice as well as the Arthur C. Clarke Award and Prince of Asturias award for Literature.

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Some of her most well known books include "The Handmaid's Tale", "Alias Grace" and "The Blind Assassin".

She has also produced a number of highly acclaimed poetry collections and non-fiction books.

The Canadian is also well known for her work as a social activist and as an environmentalist.

She has called on leaf blowers and lawn mowers to be banned because of their environmental repercussions and will be a surprise visitor to the World Economic Summit in Davos.

Here's your chance to send a question to Margaret Atwood.

Perhaps you want to know what her favorite book is or how she got into writing. What does she think will happen to the world economy in 2010? How worried is she about the economy.

Please post your questions below.

Sir Ian McKellen's career has spanned playing characters as diverse as Shakespeare's "Hamlet" to comic book villain, Magneto in "X-Men".

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The English-born actor's portfolio includes both stage and screen - he was given a Tony award and two Academy Award nominations.

McKellen is also an openly gay actor and has been a strident activist for lesbian, gay, bi-sexual and transgender rights.

He is currently performing in London in the stage production of "Waiting for Godot" until April 2010.

Here's your chance to ask him a question.

Do you want to know what it was like being part of "X-Men" or "Lord of the Rings"? Does he have a favorite movie he was in? Maybe you want to know what it's like being gay in Hollywood.

Please post your questions below.