Under the Fifth Sun
Malcolm Boothe was a well-known electronics scientist in the Auraria/Denver Technological Enclave. He was killed in a laboratory explosion some years ago. He was one of the three people in the Golden Republic area who was adept at creating large-scale vacuum-tube devices. He was in the process of teaching much (all) of what he knew to his protégé, Simone Hodgins, when he was killed.