Mario Gabelli, Chairman & CEO of GAMCO Investors, Inc., on portfolio construction and who he believes could be the next John Malone.

The Interview discusses: His decision to start his own firm in the 1970s despite a horrendous economic backdrop. His new book Merger Masters that he wrote with Kate Welling. The rationale behind taking his company public and whether he would do so again. His thoughts on portfolio construction including how many positions should be in a portfolio and how long it takes him to become fully invested for a new account.  How he incorporates tax ramifications into his sell decision. His process of what he does when a stock within his portfolio increases or decreases by a significant amount in a short period of time. Who he believes could be the next John Malone. His thoughts on Discovery Communications, Madison Square Garden and Disney. Biography Mario J. Gabelli is the Chairman and Chief Executive Officer of GAMCO Investors, Inc., the firm he founded in 1977 that currently manages over $40 billion. A 1965 summa cum laude graduate of Fordham University"s College of Business Administration, he also holds an M.B.A. from Columbia University Graduate School of Business.  He was Morningstar"s Portfolio Manager of the Year in 1997. He was named Money Manager of the Year by Institutional Investor for 2011 and is a member of Barron"s All-Star Century Team.