Kare is surprisingly unknown in the computer community. Everybody in design knows who she is, of course. Not only did she design the Mac icons, she designed some of the original Windows icons, some of the iPhone icons, and some of Facebook's icons. Her artwork has been seen by billions of people.
Her web site is "kare.com". Lots of icons.
Not to mention the most played video game of all time: Windows Solitare.