For my German-speaking readers:
About two weeks ago, I gave a keynote on Positive Psychology at the Fifteen Seconds Festival in Graz/Austria. It covers a short introduction to Positive Psychology, some scientific facts on the relationship between treating your employees exceptionally well and the financial returns of a company (based among other things, on the research of Prof. Alex Edmans), and a model of exceptional leadership based on ideas of Prof. Michael F. Steger.
Share and enjoy!