after struggling personally the last few years with anxiety/depression I made it a mission to learn more about meaning, evolutional psychology (why we are the way we are), positive psychology (which isn't just positive affirmations, but a slant on Psychology that emphazies "the good things, e.g. happiness", not just psychosis/disorders that fill the DSM-IV), and personal development in general.
being a novice in the above arenas I try to make selections from authors who dedicated their lives in an academic environment, not someone who just picked up on the latest "buzz words" and are just trying to sell books.
I started with Frankl's "Man's Search for Meaning" and his concept of logotherapy. I revist that book often.
Amazon.com: Man's Search for Meaning (9780807014271): Viktor E. Frankl: Books