In this article, we will take a look at the Billionaire Mario Gabelli's Top 12 Dividend Stocks. GAMCO Investors is a diversified asset management and financial services company. It provides investment services through its subsidiary, GAMCO Asset Management. The unit manages separate accounts for high-net- worth individuals, institutions, and qualified pension plans. The company also advises a family of mutual funds. Mario J. Gabelli serves as the firm's Chairman. He founded Gabelli with a simple goal of usi ...