Tue, 01/31/2023 - 06:00 Tech Insider Heidi Zak, the founder of the bra company ThirdLove, used to work for McKinsey & Co.Hollis Johnson Tags Small Business, Entrepreneurship, Careers, Features, Alumni, Startups, Founder, McKinsey & Company, Bain and Company, Jeff Bezos, Stewart Butterfield, Consulting Source The 10 companies that produce the most startup founders, including Bain, McKins…