Authors & the Movies: Who Has Been Adapted the Most?

With the upcoming edition of Far from the Madding Crowd starring Carey Mulligan soon to be in theaters, it got me thinking about major authors and how frequently they end up in movie theaters.  There are certain authors that seemingly have had every single one of their movies turned into books, but I thought I would put that theory to the test, so I researched ten different authors that are constantly in your local theaters, and tried to deduce which of them have truly exhausted their back-catalog of works and which still have a while to go.  Take a look:

Thomas Hardy
Number of Novels: 14
Most Famous Cinematic Adaptation: Probably Roman Polanski's 1980 version of Tess of the d'Urbervilles.  The film starred Natassja Kinski as the title character, and received six Oscar nominations, including for Best Picture.
Has Everything Been Adapted: Weirdly no.  One of Hardy's biggest novels hasn't received the big-screen treatment: Return of the Native (its only interpretation is a 1994 Hallmark Hall of Fame movie).  Some of his lesser-known romances (like The Trumpet-Major and A Pair of Blue Eyes) have also never been filmed.

Jane Austen
Number of Novels: 6
Most Famous Cinematic Adaptation: Hmm, if we're talking big-screen it might be Sense and Sensibility, which starred Emma Thompson and Kate Winslet and was nominated for Best Picture.  However, if we expanded to TV movies, it surely would be the BBC version of Pride and Prejudice with Colin Firth and Jennifer Ehle.  Combined the two films started off a new wave of 20th Century love of all things Austen.
Has Everything Been Adapted: While the BBC has adapted all of Austen's novels, two of them have never reached a theatrical release: Persuasion and Northanger Abbey.  I suspect that, despite both probably poised to do quite well in art houses if they decided to adapt the films, that we will see at least another Pride and Prejudice interpretation before either film is released.  Oddly enough it seems like her most famous short story (Lady Susan) is being made into a big-screen adaptation before either of them, and is set to star Kate Beckinsale and Chloe Sevigny if IMDB is to be trusted.

Charles Dickens
Number of Novels: Either 14 or 20, depending on how you consider the novellas and Edwin Drood
Most Famous Cinematic Adaptation: Surely we can just say the cumulative impact of A Christmas Carol would count here, with myriad actors having tackled Scrooge (though I would argue the quintessential one would be Alastair Sim's interpretation in 1951).
Has Everything Been Adapted: Dickens is helped dramatically by being so popular when silent films were released, as many of his second-tier works (like Bleak House) have only received the big-screen treatment in the pre-1930 era.  However, I can find no big-screen, feature-length adaptations of Martin Chuzzlewit, which is his only novel not brought to the big screen in such a fashion.

The Bronte Sisters (Anne, Charlotte, and Emily)
Number of Novels: 7 (4-Charlotte, 2-Anne, and 1-Emily)
Most Famous Cinematic Adaptation: Though Jane Eyre has been done more, Wuthering Heights with Laurence Olivier and Merle Oberon is probably your best bet for "quintessential."
Has Everything Been Adapted: Weirdly not as many as you would think considering the penchant for Jane and Wuthering.  Four of the seven have never reached the big-screen: Agnes Grey, The Tenant of Wildfell Hall, The Professor, and most shockingly Charlotte's Villette, which is considered by many to be Jane Eyre's equal.

Cormac McCarthy
Number of Novels: 10
Most Famous Cinematic Adaptation: No Country for Old Men, which ended up winning the Best Picture Oscar in 2007.
Has Everything Been Adapted: McCarthy is a bit behind some of these other authors, though it seems like every couple of years another of his books is made into a movie and he writes so sparingly that directors will soon catch up with him.  The most famous of his works not to be adapted is Blood Meridian, which has been rumored as a film for a decade but hasn't yet reached the big-screen.

William Shakespeare
Number of Plays: Shakespeare of course wrote plays rather than novels (a different and more adaptable beast), but he's filmed so often that I'm including him.  38 plays are considered part of the Canon.
Most Famous Cinematic Adaptation: Though Laurence Olivier seemed to tackle everything, the only of his movies to win the Best Picture Oscar was 1948's Hamlet.  It's likely, however, that Romeo + Juliet from 1996 (with Leonardo DiCaprio and Claire Danes) has permeated modern culture more.
Has Everything Been Adapted: Nope, especially if you're only counting TV adaptations.  Some of his most famous comedies, including All's Well that Ends Well and Measure for Measure, have only been brought to the TV screen, not the big-screen.  It's worth noting that Timon of Athens and Troilus and Cressida are the only dramas not to be brought to the big-screen and that all of the plays have at least been filmed for British television.

Roald Dahl
Number of Novels: 19
Most Famous Cinematic Adaptations: Surely Willy Wonka & the Chocolate Factory, starring Gene Wilder, which has become a major source of pop culture (everyone's mimicked it at some point).
Has Everything Been Adapted: Nope.  The BFG is supposedly coming next year from Steven Spielberg, but that still leaves a couple of other films including The Twits and Charlie and the Great Glass Elevator, which weirdly never became a film despite two successful iterations of the first book.

John Grisham
Number of Novels: 29
Most Famous Cinematic Adaptations: You may be raising an eyebrow here, but during the 1990's you could not go to the cinema without seeing a John Grisham novel in theaters.  Every new novel was treated as an event, and he was a MAJOR force in publishing.  Probably his most famous adaptation was The Firm with Tom Cruise and Holly Hunter.
Has Everything Been Adapted: No.  When Grisham started writing non-legal thrillers, his celebrity waned and many of his books stopped being the source for movies.  That said, it's a little odd that the only one of his first few novels not to get a film adaptation was The Street Lawyer, which nearly became a television series but enigmatically wasn't picked up for a full season despite Grisham's popularity at the time and a filmed pilot.

George Eliot
Number of Novels: 7
Most Famous Cinematic Adaptations: Despite the fact that numerous adaptations of Eliot's work have made it to the big-screen, none of them really stand out as memorable.  Perhaps Lillian Gish's work in Romola or Geraldine Fitzgerald in The Mill on the Floss?
Has Everything Been Adapted: Damn close.  Weirdly the only of her seven novels to not get a big-screen treatment is Middlemarch, which is considered by many to be her finest work.

Michael Crichton
Number of Novels: 28 (though a number of these were not released under his name)
Most Famous Cinematic Adaptations: Surely this would be Jurassic Park, one of the most successful films of all-time, though Crichton has released some other really major movies that could eclipse most of the rest of this list pop culture-wise.
Has Everything Been Adapted: If we throw out the John Lange, Michael Douglas or Jeffery Hudson novels (his pseudonyms), it's not far from it.  Airframe is one of the most noted novels by Crichton that has never been translated to the big-screen, and his earliest work that hasn't been adapted that was written under his own name.

What do you think?  Which author do you think will complete his/her full list of novels to the big screen first?  What other authors should I have listed here?  Share your thoughts in the comments!