Career advice from Sheryl Sandberg and Amex CEO Chenault by Patricia Sellers @FortuneMagazine March 27, 2013, 2:24 PM EDT E-mail Tweet Facebook Google Plus Linkedin Share icons Here’s a workplace dilemma: How does a male boss mentor a woman in a world where 64% of men are afraid to be in a room alone with a female employee? Ken Chenault has no fear. “You’ve got to develop relationships. You can’t do things just in a formal context,” says the American Express CEO, who promotes informal mentoring at his company. Here’s Chenault and Facebook COO Sheryl Sandberg talking with me about workplace challenges and Lean In‘s lessons for high-powered bosses like him. And do you want to know how Sandberg applies her Lean In philosophy to her own life at work and at home? Listen to my podcast interview here.