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While he was in school, we needed to pay our bills. I had to get a job. I'd majored in music (piano). I had no business credentials, connections, or confidence, so I started as a secretary to a retail sales broker at Smith Barney in midtown Manhattan. It was the era of Liar's Poker, Bonfire of the Vanities, and Working Girl. Working on Wall Street was exciting. I started taking business courses at night and I had a boss who believed in me, which allowed me to bridge from secretary to investment banker. This rarely happens. Later I became an equity research analyst and subsequently cofounded the investment firm Rose Park Advisors with Clayton Christensen, a professor at Harvard Business School. When I walked onto Wall Street through the secretarial side door, and then walked off Wall Street to become an entrepreneur, I was a disruptor. "Disruptive innovation" is a term coined by Christensen to describe an innovation at the low end of the market that eventually upends an industry. In my case, I had started at the bottom and climbed to the top—now I wanted to upend my own career. No wonder my friend thought I'd lost my sanity. According to Christensen's theory, disruptors secure their initial foothold at the low end of the market, offering inferior, low-margin products. At first, the disrupter's position is weak. For example, when Toyota entered the U.S. market in the 1950s, it introduced the Corona, a small, cheap, no-frills car that appealed to first-time car buyers on a tight budget.
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Whitney Johnson (Disrupt Yourself: Putting the Power of Disruptive Innovation to Work)