Afton Vechery, CEO & Co-Founder of Modern Fertility

Afton Vechery is the CEO and co-founder of Modern Fertility, which is a health company that makes fertility information more accessible to women and offers a comprehensive at-home fertility test. These are the same kinds of hormone tests that are given in fertility clinics, but they go for a fraction of the price via Modern Fertility. The company earned about $7 million in funding from investors like First Round Capital, Maveron, and Union Square Ventures. Vechery made Fortune's "40 Under 40" list and Forbe's "30 Under 30" list for her entrepreneurship.

Her best advice: "We did nothing but work on the company for three months,” she told Entrepreneur. “We had a list called AC -- a running list of everything going on in the company, things that Afton was doing, things Carly was doing. We built this company list by list.”