29, U.K. FOUNDER TROPIC SKINCARE
When she was 15, Ma, a shanghai native, started making homemade skin-care products, such as moisturizers and masks, to help her mother make ends meet. the venture eventually covered her college tuition and earned her a spot as the youngest contestant to appear on the bbc version of The Apprentice. her vegan, cruelty-free beauty line, tropic skincare, generated
$27 million in revenue last year.