Walter Mosley hates to be pigeonholed. Perhaps that goes back to his origins: His mother was Jewish, his father African-American. His genealogy perhaps instilled in him a desire to explore different avenues, and that's what his life has been about. A computer programmer until he was 34, he's now spent two decades as a prolific and successful writer. His first play, 'The Fall of Heaven,' is receiving its world premiere at Cincinnati Playhouse in the Park.