Shawn Achor — American Educator

Shawn Achor is an American happiness researcher, author, and speaker known for his advocacy of positive psychology. He authored The Happiness Advantage and founded GoodThink,Inc. His TEDxBloomington talk "The Happy Secret to Better Work" is one of the 20-most viewed TED talks... (wikipedia)

Our daily decisions and habits have a huge impact upon both our levels of happiness and success.
We not only need to work happy, we need to work at being happy.
Success does not mean happiness. Check out any celebrity magazine to look for examples to disabuse you of thinking that being beautiful, successful or rich will make you happy.
You have to train your brain to be positive just like you work out your body.
The idea of investing in the positivity of employees is often low down on companies' priority lists.