Dan has been active in finance, strategy & business building for more than two decades. He has focused on technology & media for most of that time. His notes are here & in his book, The Age of Convergence (2013).
I am breaking all the diversification rules right now by keeping almost 90% of my money in AIG. I used to hold ARR or AGNC, but I have switched to AIG in Sept 2012.
Portfolio contents at 12/31/2013
AIG (92%) BAC(4%) BRK.B(2%), AGNC (2%) ARR(1.5%)