Reiner Knizia is a prolific German-style board game designer. He was born in West Germany in 1957 and earned a doctorate in Mathematics from the University of Ulm before designing games full time. He is frequently included on lists of the greatest game designers of all time. Many of his hundreds of designs are considered modern classics, and many have won or been nominated for significant gaming awards, including the Spiel des Jahres and the Deutscher Spiele Preis. His notable designs include Amun-Re, Blue Moon City, Ingenious, Keltis, Lord of the Rings, Medici, Modern Art, Ra, Taj Mahal, Tigris and Euphrates, and Through the Desert. Many of his designs incorporate mathematical principles, such as his repeated use of auction mechanics.

Ingenious is the English name for Einfach Genial, a German abstract strategy board game designed by Reiner Knizia under commission from Sophisticated Games and published in 2004 by Kosmos. Across most of Europe it is titled as the local translation of Ingenious or Simply Ingenious, the notable exception being Mensa Connections in the UK.