Solon grew up on Earth. (TV: The Brain of Morbius) At some point, Solon authored a famous paper on microsurgical techniques in tissue grafting, which the Fourth Doctor had heard about or read. Solon overcame the "problem of tissue rejection". After writing the article, and dogged by rumours that he had joined the personality cult of Morbius, Solon went into hiding on the planet Karn. Although Morbius was eventually executed and his body disintegrated, Solon managed to save his brain and was able keep it alive. (TV: The Brain of Morbius, PROSE: Warmonger)