“[He] was best known for his The Stainless Steel Rat series, starring the free-spirited anti-hero Slippery Jim DiGriz, a quick-witted conman who travels the universe swindling humans, aliens and robots alike. His 1966 work, Make Room! Make Room! – a sci-fi take on the horrors of overpopulation – inspired the 1973 film Soylent Green starring Charlton Heston.”