Edward Whitacre, Jr. — American Businessman born on November 04, 1941,

Edward Earl "Ed" Whitacre, Jr. is the former Chairman and CEO of General Motors. He is also a former chairman of the board and chief executive officer of AT&T Inc., previously Southwestern Bell Corporation . He served as national president of the Boy Scouts of America from 1998 to 2000. On September 1, 2010, Whitacre stepped down as CEO, and retired as chairman of the board by the end of 2010... (wikipedia)

Be willing to step outside your comfort zone once in a while; take the risks in life that seem worth taking. The ride might not be as predictable if you'd just planted your feet and stayed put, but it will be a heck of a lot more interesting.
No partnership between two independent companies, no matter how well run, can match the speed, effectiveness, responsiveness and efficiency of a solely owned company.
I started at GM knowing very little about that particular business. Not being an expert means you have to learn everything, starting from the basics.
Find your passion is in life, and do what you can to integrate that into your work life. That's not to say you won't have occasional frustrations in your job - that just goes with the territory - but at least you'll feel better inside, and that, over time, will mean more to you than you might think.
When I got to GM they were using a matrix method of management which means everybody has more than one boss. I first heard about that system many years ago. It's supposed to help with collaboration, but my assessment is that it's pretty hard to get geared for action that way.