I was surprised to learn that he was heavily influenced by Aristotle.
I would be curious what Seligman attributes to Aristotle in the development of positive psychology.
Positive psychology appears to fall into the objective approach to happiness, which I found quite interesting at the time as I couldn't put my finger on what bothered me about it.
I'd be interested to hear more of your thoughts on that topic. I think positive psychology has some useful findings to share, but I'm sometimes skeptical of their data when it's from self-reported surveys.