Keith Ian Giffen (November 30, 1952–October 9, 2023) was an American comics artist and writer. He was known for his work for DC Comics on their Legion of Super-Heroes and Justice League titles as well as for being the co-creator of Lobo, Rocket Raccoon, and Jaime Reyes. Description above from the Wikipedia article Keith Giffen, licensed under CC-BY-SA, full list of contributors on Wikipedia.
