Last week was a tough week for some kings of finance. The heads of Citigroup and Merrill Lynch jumped, or were pushed, out of their jobs. In the months prior there were rumblings at lower levels, including the "resignation" (who knows?) of a financial services executive who had come to speak to our class at Columbia back in the spring.

He gave a good presentation about becoming more than just a tech person, becoming a strategist and a leader. He may have mentioned ambition, how much you have to want that brass ring to do the work that it takes to get it.

I thought hard to find a question for the Q&A. I raised my hand and he called on me.

"How do you measure your own success?"

That's where it took a turn. He didn't talk about money he's made, or jobs he's created, or people he's mentored. He said that he wasn't sure about calling himself a success. He found great fulfillment in the challenges of his work. Once, years back, when his family was settled in a house and in their lives on the East Coast, he'd gotten a job in Detroit, and he'd uprooted his family (including his college-age child) to move them to Michigan. His wife left him.

So, he said, he didn't know whether he'd succeeded or not, how to measure that.

I said: the measure is, would you do it all over again?

Someone said "whoa." The executive thought, and the room was silent, and he said he didn't know.

I've heard classmates reference that exchange, months later. They are grateful to him for his honesty. I wonder what they'll remember me for.