I'm making a list of influential designers, artists, etc. from all walks of life—everyone from Leonardo Da Vinci to Roger Black. This has nothing to do with Macs, I'm just using this space so I can add to my list from wherever I am.
Michael Mann: Miami Vice, Band of the Hand, Heat
Harley Earl: GM head in the 1950s, responsible for the brasierre-like chrome bumpers, tailfins, and much more.
Herb Ritts: Black-and-white photographer, famous for his work with supermodels and for some music videos he directed--Wicked Game by Chris Issac, something with Janet Jackson, and something with Madonna--all 3 in black and white on a beach.
Roger Black - designer for Esquire, Rolling Stone, and other magazines in the 70s and 80s. Everything is red, white, and black.
David Siegel - self-described "HTML terrorist" who revolutionized website design with borderless tables and clear GIFs in 1997. Seminal book <i>Killersites</i>.
Frank Lloyd Wright - architect behind Falling Water and the Guggenheim museum.
Tim Burton
Kurt Cobain - grunge, Sprite logos
Alfred Hitchcock
Stan Lee
Chuck Jones
Spike Jonze--directed Sabotage
Unrelated, but I gotta list them somewhere:
Landmark Digital Effects Films