Michael Anthony Foster (July 2, 1939 - November 14, 2020) was an American science fiction writer from Greensboro, North Carolina. He spent over sixteen years as a Captain and Russian linguist in the United States Air Force. "Ler" books He wrote a loosely connected trilogy about an offshoot of humanity called the Ler: The Warriors of Dawn (1975), The Gameplayers of Zan (1977), and The Day of The Klesh (1979). The Gameplayers of Zan takes place much earlier than the others, on Earth, and details the Ler's departure from Earth; the other two books cover two separate human-Ler encounters on other planets. The "game" from the title of The Gameplayers of Zan is based on cellular automata, a more intricate version of Conway's Game of Life. The Warriors of Dawn mostly concerns the relationship between a human man and a ler woman, and The Day of The Klesh represents the ler as a mostly inscrutable humanoid race. The Gameplayers of Zan, on the other hand, discusses the origins of the Ler as an engineered offshoot of humanity, and is as much about ler culture as their interactions with humanity. Most of the action in this book takes place in Unwharrie National Forest, North Carolina. Ler reproduce infrequently, only becoming fertile at age thirty after a long adolescence: they experience two fertility periods, five years apart. Hence most ler females have only two children, but occasionally they have a third, and twins are not unknown. Ler family structure is organized around a "braid," which they have designed to preserve maximum genetic diversity to offset their low initial population and small birth rate. A braid starts with two "fore-parents". They mate and produce the "elder outsibling". Then each of the fore-parents goes forth and brings back another ler of the appropriate gender, the "after-parents". The fore-parents each mate with an after-parent and produce the "insiblings", five years younger than the elder outsibling. Then the after-parents mate and produce the "younger outsibling", five years younger than the insiblings. The insiblings remain in the braid and become the fore-parents to the next generation; the outsiblings will leave to join other braids as after-parents. The rare surplus children tend to be given the responsibility of beginning completely new braids together. Alternation in the gender of children is enforced with pheromones. In rare cases, sometimes on purpose, two same-sex insiblings are born; the braid line ends