MICHAEL RUBIN

$2.9

BILLION  SELF-MADE SCORE: * SOURCE: ONLINE RETAIL AGE: 47 RESIDENCE: BRYN MAWR, PA PHILANTHROPY SCORE: At age 8, Rubin started selling vegetable seeds and homemade stationery door-to-door in his suburban Philadelphia neighborhood. At 10, he hired other kids to shovel driveways. At 12, he started a skituning shop, pictured above, in his parents’ basement; it spun out enough cash for him to buy a Porsche before he turned 16 and netted him his first million by age 18. Today, Rubin’s fortune stems from his majority ownership in e-commerce companies including Fanatics and Rue Gilt Groupe.