2 of 6
Mark Lewis, 48
Then: Software developer
Now: President of the company

Reinventions come in sizes big and small, and sometimes the hardest moves are rank changes within the same company.

Since 1999, Mark Lewis has been working at Lexington, Ky.-based Tenmast, a company that provides software to government housing authorities. He was putting his tech background to use as a software development manager, but he wasn't satisfied.

"I was frustrated," he says. "My boss came to me and said I seemed unhappy, and was letting my frustration show."

In 2007, Lewis reexamined his goals. "I began communicating differently to my coworkers. Working through the problems of a business became a passion."

His colleagues took note. Lewis' boss observed that he might be happier in an upper-level management position, and together they prepared him for a move into the president position, just below the CEO.

Before, Lewis managed nine people. Now, as president of Tenmast, he oversees 70. But the number of people under his watch is not all that has changed.

"When I was in the development position, my problem-solving opportunities were directed toward computers. I never applied that to people. I now have all the senior managers reporting to me, and I do all the budgeting and envisioning for the company. It's a completely different role."

In 2010, the first year of his presidency, Tenmast exceeded its budget plan. Lewis says that success is wonderful, but being happy at work is even better. "The satisfaction level of my job is completely different now."

NEXT: Amelia Heape, 40
Last updated February 07 2011: 5:38 PM ET
When Pamela Mitchell got laid off in 2002, she realized it wasn't time for a new job - it was time for a whole new perspective. More
Using social media options like LinkedIn can be a great way to network your way to a new job. But if you're already working, it's smart to keep a low profile. Here's how. More
Experts and coaches remind us daily about the importance of keeping in touch with your network. If you're like me, LinkedIn just handed you the perfect alibi on a silver platter. More

Most stock quote data provided by BATS. Market indices are shown in real time, except for the DJIA, which is delayed by two minutes. All times are ET. Disclaimer.

Morningstar: © 2015 Morningstar, Inc. All Rights Reserved.

Factset: FactSet Research Systems Inc. 2015. All rights reserved.

Chicago Mercantile Association: Certain market data is the property of Chicago Mercantile Exchange Inc. and its licensors. All rights reserved.

Dow Jones: The Dow Jones branded indices are proprietary to and are calculated, distributed and marketed by DJI Opco, a subsidiary of S&P Dow Jones Indices LLC and have been licensed for use to S&P Opco, LLC and CNN. Standard & Poor's and S&P are registered trademarks of Standard & Poor’s Financial Services LLC and Dow Jones is a registered trademark of Dow Jones Trademark Holdings LLC. All content of the Dow Jones branded indices © S&P Dow Jones Indices LLC 2015 and/or its affiliates.