Off the top of my head: (less career and more personal development)
1. Finite & Infinite Games, by James Carse
2. Flow, by Czikszentmihalyi
3. The evolving self, by Robert Kegan
4. Man's search for meaning, by Victor Frankl
5. A fine balance, by Rohinton Mistry (fiction)
6. Lila, by Robert Pirsig (fiction)