Harper Collins
Harper Collins can trace it's routes back over 200 years and is the child of Scottish publishers William Collins & Sons - who published works by HG Wells, Agatha Christie, JRR Tolkien and CS Lewis along with printing the Bible - and the New York based Harper Brothers Company who published the works of Mark Twain, the Bronte Sisters, Thackeray, Dickens, John F Kennedy and Martin Luther King Jr (amongst others).
They are often considered amongst the foremost publishers of English language books and publish diverse works from Dr Seuss to George RR Martin including Nobel prize-winners and worldwide bestsellers.