Peter Hamilton. I've been reading scifi for 52 years and have read all of the greats and agree with most of the comments so far. But I was surprised to see no one has mentioned the best grand saga ever, "The Reality Dysfunction". This 5 or 6 (?) Volume series SO deserves a movie series like Star Wars or The Lord of the Ring to do it justice. You MUST read - just be sure to read them in order. My brother and I have been exchanging favorite books for years, but he gave me the series back explaining that he "just couldn't get into it". Later I found out he had started with the third volume...
Chalker would also require a time machine. Card is the only living one in the bunch.
Chalker was great. Well of Souls series and Four Lords of the Diamond would be great movie material...maybe somebody Hollywood-ish will "discover" his work someday.
Card would be an excellent choice for presenting...but I still stand by Greg Bear.