Martin Seligman

http://en.wikipedia.org/wiki/Martin_Seligman

http://www.authentichappiness.sas.upenn.edu/Default.aspx

http://en.wikipedia.org/wiki/Learned_helplessness

http://ematusov.soe.udel.edu/final.paper.pub/_pwfsfp/00000062.htm

http://www.youtube.com/watch?v=gFmFOmprTt0