Not to flatter myself, but I am exactly who Sheryl Sandberg had in mind when she decided to write Lean In: Women, Work, and the Will to Lead. Thirty-five, married, mother of two young (but not too young) children, MBA who has worked consistently in one high-status industry for over a decade, and who is grappling with the next steps in her career. I’ve even got her name. And I am completely ready and willing to take in Sandberg’s advice, because I know I’m on the precipice of something. Maybe something big. I’m a year or two away from my next promotion at the investment firm where I’ve worked...