Derek Sakamoto is the lead user interface designer for Hearthstone: Heroes of Warcraft and has been on the project since its inception. He has spent the last 13 years at Blizzard designing user interfaces for World of Warcraft, The Burning Crusade, Wrath of the Lich King, and Hearthstone. He also was the art side of The Creeps!, a mobile tower defense game in the early days of the iPhone App Store.