Howard Stevenson of Harvard Business School once argued that the essence of enterprise is the pursuit of opportunities regardless of the resources you currently control.

ECONOMIST: Schumpeter

Using 35 years of data from the General Social Survey, two Wharton School economists, Betsey Stevenson and Justin Wolfers, made the case in 2009 that women's happiness appeared to be declining over time despite their advances in the work force and education.

WSJ: Has the Sexual Revolution Been Good for Women? Mary Eberstadt: No

Howard Stevenson, a professor at Harvard Business School, says that many clusters die because their founders, or their founders' children, reinvest their fortunes elsewhere.

ECONOMIST: What it takes to come top in technology

Stevenson told me that his favorite teacher was a high school math teacher, George Barton.

FORBES: Teaching Lessons from a 43-Year HBS Veteran

In June I asked Harvard Business School (HBS) Emeritus Professor, Howard Stevenson, his thoughts on five key start-up choices.

FORBES: HBS's Howard Stevenson: How Start-ups Gain Market Share

In the winter of 2007, Professor Howard Stevenson died of a cardiac arrest steps from his Harvard Business School (HBS) office.

FORBES: Lessons From a $1 Billion Fund Raiser

Betsey Stevenson, an economist at the University of Pennsylvania's Wharton School and former chief economist at the U.S. Labor Department, said that for some women, greater career ambition means less free time and a decline in overall happiness.

WSJ: Women Set New Goals for Careers and Lives