Geoffrey Monck was a powerful mage and a member of the Novigradian Union along with Jan Bekker and Giambattista. He was also an original member of the Chapter of Wizards, and one of the first nordlings to master the magic of the Elder Races. He was the author of The Magic of the Elder Folk, The Theory and Practice of Using Teleportals, and co-author of Natural Magic with Ivo Richert.
Geoffrey became famous because of his habit of trapping djinns in bottles and extracting three wishes out of each genie so ensnared. Apparently, he was able to conjure whirlwinds and hurricanes, as well as levitate with the help of his prisoners. He sealed each bottle with a sign depicting "a broken cross and a nine-pointed star".
- In The Witcher 2: Assassins of Kings, he's mentioned by Carduin while the sorcerer and Geralt are discussing Loc Muinne's history.