To better understand how to build an income producing portfolio I researched portfolios by super investors running income portfolios. Jeffrey Gundlach is the former manager of TCW Total Return Bond Fund (TGLMX). After being fired he started the firm Doubleline. In his 15-years at the mortgage-focused TCW fund its 7.2% annualized gain put him among the top producers of the intermediate-bond category. Gundlach also won the Morningstar Fixed-Income Fund Manager of the Year award in 2006 and Barron's dubbed him King of Bonds. Gundlach did induce some bad press at times, which doesn't make him particularly endearing. Neither do I have access to any exciting investment writing by him and therefore I can't say he is a well of inspiration like King of Cash, Murray Stahl, whose income investing approach I've also discussed. Undeniably, Mr. Gundlach gets very good results and it would be stupid not to look at…