Jon Vacko joined CALAMOS ADVISORS in 2000 and has been a Co-Portfolio Manager, Co-Head of Research since August 2013. Previously, he was a Co-Head of Research and Investments from July 2010 to August 2013. Prior thereto he was a senior strategy analyst between July 2002 and July 2010. Jon Vacko is a Senior Vice President and Co-Portfolio Manager on the Calamos Growth/Fixed Income Team. He is currently responsible for portfolio management and research. He is also a member of the Investment Committee. Prior to joining Calamos, Mr. Vacko was a credit analyst with Duff & Phelps Credit Rating (now part of Fitch Ratings) in the Financial Institutions Group. Previously, he served as an Examiner with the Federal Reserve Bank of Chicago. Mr. Vacko is also a CFA charterholder and a member of the CFA Institute.

As a Co-Chief Investment Officer, John Hillenbrand is responsible for oversight of investment team resources, investment processes, performance and risk. As Head of Multi-Asset Strategies and Co-Head of Convertible Strategies, he manages investment team members and has portfolio management responsibilities for those investment verticals. He is also a member of the Calamos Investment Committee, which is charged with providing a top-down framework, maintaining oversight of risk and performance metrics, and evaluating investment process. John joined Calamos in 2002 and has 24 years of industry experience. Prior to joining Calamos, he served as an equity research analyst at Credit Suisse First Boston and ABN AMRO and as an Account Manager - Business Credit Group at Continental Bank. John received a B.B.A. in Public Accounting from Loyola University and an M.B.A. in Analytic Finance from the University of Chicago Graduate School of Business. He is also a member of the American Institute of Certified Public Accountants.

John P. Calamos is the founder of CALAMOS ASSET MANAGEMENT, INC., the 16th largest money manager in Chicagoland. The firm offers institutional and individual investors a breadth of strategies through both individually managed portfolios and mutual funds. Mr. Calamos received his undergraduate degree in Economics and MBA in Finance from the Illinois Institute of Technology. Joining the United States Air Force after graduation, he served as a combat pilot during the Vietnam War and ultimately earned the rank of Major. Following his military service, John devoted his entire professional career to investment management and research, establishing his own firm in 1977. Mr. Calamos is a member of the Investment Analysts Society of Chicago and has taught graduate level courses on finance and investments. Mr. Calamos has written two books: Investing in Convertible Securities: Your Complete Guide to the Risks and Rewards, and Convertible Securities: the Latest Instruments, Portfolio Strategies, and Valuation Analysis, along with numerous articles in various financial journals. He is often quoted in the press, including The Wall Street Journal, Investor’s Business Daily, Barron’s, Fortune, BusinessWeek and Pensions & Investments. He has appeared on CNBC, CNNfn, Louis Rukeyser's Wall Street and Nightly Business Report.