Walker, 31, is the founder of Walker & Company Brands, a health and beauty startup geared toward people of color. He's also cofounder of nonprofit CODE2040, which pairs black and Latino engineering students with summer internships in Silicon Valley.
On working out:
"[I workout] five days a week. Necessary! I'm usually in the gym by 6 a.m. I box three days and run or spin the other two."