Sarah-HaselkornAs a junior at WashU, Sarah Haselkorn, EN ’13, opened Green Bean, an eco-friendly salad restaurant. A serial entrepreneur, she is now chief technology officer of her second startup, Unfettered Socks, a line of performance-focused men’s business socks. Haselkorn started writing columns for Entrepreneur in 2013, where she offers advice to young entrepreneurs. View her columns: entrepreneur.com/author/sarah-haselkorn.