Today he blogged about measuring success. I found it very refreshing to find somebody as successful as he is being so pragmatic about where happiness (true success) really comes from. When people have asked me for career or education advice, I tell them to find what they enjoy doing and pursue that. I say that because, no matter how much money you make, if you don't like your job, you will be miserable. So find what is important in your life focus on that.
In his blog, Halamka says that but a lot more eloquently. Give it a read, I think you'll be impressed.