The three primary designers behind the d20 System were Jonathan Tweet, Monte Cook and Skip Williams; many others contributed, most notably Richard Baker and Wizards of the Coast then-president Peter Adkison.
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Clark Peterson and his old friend Bill Webb formed Necromancer Games in the spring of 2000 to publish role-playing materials using the impending d20 license; on August 10, 2000, the same day Wizards of the Coast was to release the new Player's Handbook at GenCon 33, Peterson and Webb published a free PDF adventure called The Wizard's Amulet just a few minutes after midnight that same day.
Other notable products include the Freeport, Thieves' World and The Black Company d20 settings, Mutants & Masterminds, Blue Rose, and True20.
Jhoneil M. Centeno (born July 1, 1969 in Metro Manila) is a Filipino/American artist best known for his fantasy cover paintings of several d20 books.
Scarred Lands is a d20 System fantasy campaign setting, by White Wolf Publishing under its Sword & Sorcery brand.