Rael Dornfest is an American computer programmer and author. He was a technical fellow and CTO of Charity: Water, and was previously an engineer at Twitter. He was founder and chief executive officer of Values of N, creator of "I Want Sandy" and "Stikkit: Little Yellow Notes that Think." Previously, he was chief technology officer at O'Reilly Media. He began working for Twitter after they bought the assets of his company Values of N.[1]