Sidney Coleman

multiverse n. 2	1973 S. Coleman Books in Magazine of Fantasy & Science Fiction Nov. 27/2 Emotionally, time travel has two faces: the bright multiverse of infinite possibility, and the grim infernal machine of closed causal loops.
world-building n.	1974 S. Coleman Books in Magazine of Fantasy & Science Fiction Aug. 57/1 The deemphasis of detailed world-building separates Niven from the writers with whom he is usually grouped, ‘hard-science’ writers like Poul Anderson or Arthur Clarke.