Tio Holtzman [d. 174 BG] was an enigmatic genius before and during the Butlerian Jihad, best remembered as the inventor of the Holtzman Effect and its subsidiary technologies including the Holtzman shield, which played a critical role in numerous technological developments. The veracity of this fact was later questioned by Leto Atreides II, who used other memory to conclude that Norma Cenva was the actual discoverer of the principle.