Daniel H. Pink
Daniel's first chapter introduces a prime example of how "the business case" falls flat on its face when trying to understand success in this new century of work - Microsoft versus Wikipedia - how could Microsoft lose in the on-line encyclopedia market to a company that relies on volunteer efforts?
This is where Daniel is able to highlight decades of study in human motivation theory - succeeding in business and in careers will be through intrinsic motivation - the key tenets: autonomy, engagement, and purpose.
If you are looking for an understanding of how we must all change to succeed in our careers and contribute to a purpose, check out Drive: A Whole New Mind!!