William Hogarth Main

William "Bill" Hogarth Main is a cave diving pioneer who is best known as a developer in the 1980s, and the namesake of, the "Hogarthian gear configuration" that is a component of the "Doing It Right" (DIR) holistic approach to scuba diving. According to Jarrod Jablonski, the Hogarthian style "has many minor variations, yet its focus asserts a policy of minimalism." The configuration was refined in the 1990s, partially through the Woodville Karst Plain Project (WKPP), established in 1985 and considered among the most aggressive cave diving initiatives in the world.

Main began diving in 1966 or early 1967 after completing the NAUI Open Water Course, made his first cave dive on a single tank in 1969, and switched to double tanks on a single regulator in 1972. Main describes this period: "There was no formal cave training back then. We just worked things out as we went along, and made the things we needed that didn't exist." Following a challenging dive, Main decided with fellow diver Bill Gavin that all WKPP deep dives would be on mixed gas.

Main, along other members of the WKPP such as Lamar English, George Irvine, and Jablonski all cultivated the idea that there was an ideal equipment configuration that should be standardized among the WKPP divers. As Main put considerable efforts towards streamlining configurations, his middle name was taken to represent the approach. Main asserts that term "Hogarthian" was initially used as a joke by fellow diving pioneer John Zumrick. While "Hogarthian" and "DIR" were sometimes used interchangeably in early descriptions of the approach, by 2010, "Hogarthian" referred to gear configuration, as opposed to the holistic system of DIR of which Hogarthian rigs were a part.