Susan Kare

Pretty much if you've used a computer, you know computer design hero Susan Kare's work. As a member of the original Mac team, she designed all of the classic Mac icons and typefaces. She has also done work for Microsoft (including the original Solitaire game for Windows 3.0), and designed icons for IBM OS/2. Since 2007 she's been designing all of Facebook's virtual gifts; I made a piece last year called "I Got You Something" that's partly addressed to her.