1. Elizabeth Holmes

Elizabeth Holmes is one of the youngest self-made billionaires in the world. She dropped out of Stanford University at the age of 19 to start her own company using her college funds as start-up money. Today, Theranos, a blood testing company, is one of the most successful in the world. Holmes wears the same black turtleneck shirt everyday, inspired by her role model, Steve Jobs, who has said he wore the “uniform” to eliminate necessary distractions.