I'm just copying and pasting this list and deleting the ones I have not read. Some of these I have not read in a long time, and I'm going from memory, is that O.K.?
Xanth series - 7
John Anthony Bellairs - The Face in the Frost - 9 (I'm glad other people have read this)
Black, Holly - The Spiderwick Chronicles - 5
James Herbert Brennan - Faerie Wars - 6
Brooks, Terry - Shannara series - 4
Stephen Brust - Vlad Taltos - 8
L. G. Burbank - Lords of Darkness - 4
C. J. Cherryh - Forge of Heaven - 7
Stephen R. Donaldson - Chronicles of Thomas Covenant - 6
Sara Douglass - Wayfarer Redemption Sextet - 8
David Eddings - Belgariad - 5
Erikson, Steven - Malzan Book of the Fallen - 5
Farland, David - The Runelords - 6
Gaiman, Neil - American Gods/Anansi Boys - 6
Goodkind, Terry - The Sword of Truth - 4
Simon Hawke - Dark Sun: Tribe of One - 7
Howard, Robert - Conan - 7
Robert Jordan - The Wheel of Time - 8
Ursula LeGuin - Earthsea - 7
C.S. Lewis - Chronicles of Narnia - 5
George R.R. Martin - Song of Ice and Fire - 7 (so far)
Terry Prachett - Discworld - 7
Rice, Anne - The Vampire Chronicles - 5
Rowling, J.K. - Harry Potter - 5
Salvatore, R.A. - Drizzt Saga - 4
Sanderson, Brandon - Elantris - 6
Tolkien, J.R.R. - The Lord of the Rings and other Middle Earth - 8
Tad Williams - Memory, Sorrow, Thorn - 9
Gene Wolfe - Long Sun - 7
Zelazny, Roger - Chronicles of Amber - 7 (love the series, hated the ending)
Zelazny, Roger - Lords of Light - 6
Unmentioned thus far:
Robert Jordan - Conan Chronicles - 8 (The definitive Conan stories, imo)
David Eddings - The Mallorean - 4
Xanth series - 7
John Anthony Bellairs - The Face in the Frost - 9 (I'm glad other people have read this)
Black, Holly - The Spiderwick Chronicles - 5
James Herbert Brennan - Faerie Wars - 6
Brooks, Terry - Shannara series - 4
Stephen Brust - Vlad Taltos - 8
L. G. Burbank - Lords of Darkness - 4
C. J. Cherryh - Forge of Heaven - 7
Stephen R. Donaldson - Chronicles of Thomas Covenant - 6
Sara Douglass - Wayfarer Redemption Sextet - 8
David Eddings - Belgariad - 5
Erikson, Steven - Malzan Book of the Fallen - 5
Farland, David - The Runelords - 6
Gaiman, Neil - American Gods/Anansi Boys - 6
Goodkind, Terry - The Sword of Truth - 4
Simon Hawke - Dark Sun: Tribe of One - 7
Howard, Robert - Conan - 7
Robert Jordan - The Wheel of Time - 8
Ursula LeGuin - Earthsea - 7
C.S. Lewis - Chronicles of Narnia - 5
George R.R. Martin - Song of Ice and Fire - 7 (so far)
Terry Prachett - Discworld - 7
Rice, Anne - The Vampire Chronicles - 5
Rowling, J.K. - Harry Potter - 5
Salvatore, R.A. - Drizzt Saga - 4
Sanderson, Brandon - Elantris - 6
Tolkien, J.R.R. - The Lord of the Rings and other Middle Earth - 8
Tad Williams - Memory, Sorrow, Thorn - 9
Gene Wolfe - Long Sun - 7
Zelazny, Roger - Chronicles of Amber - 7 (love the series, hated the ending)
Zelazny, Roger - Lords of Light - 6
Unmentioned thus far:
Robert Jordan - Conan Chronicles - 8 (The definitive Conan stories, imo)
David Eddings - The Mallorean - 4