Milton A. Rothman was best known to generations of science-fiction readers for a single classic story written at age 19: "Heavy Planet," published under the byline of "Lee Gregor" in 'Astounding Science Fiction' in 1939 at the beginning of the Golden Age and kept in print for decades in the classic anthology 'Adventures in Time and Space'. He was also a pioneer of early fandom, a founder of the Philadelphia Science Fiction Society, a fanzine publisher, and a World Science Fiction Convention chairman. After World War II, he became one of the country's leading nuclear physicists, but continued to write science fiction throughout his life. Here, for the first time, all his science fiction stories are collected in one volume, giving a clear picture of the author's development from youth to old age, reflecting lifelong preoccupations with physics, mathematics, music, the futility of war, and, of course, science fiction itself. Here is an authentic voice from the early years of the modern science fiction field. Features an introduction by science fiction master Frederik Pohl.