Calamos Investments, a US-based investment management firm, has appointed R. Matthew Freund as co-portfolio manager for various mutual funds and closed end funds.

Freund, who has over two decades of experience in investment management, was recently hired as co-chief investment officer and head of fixed income strategies.

Prior to joining Calamos, he served as chief investment officer at USAA Investments, where he oversaw more than $140bn in assets.

He also led the teams responsible for the portfolio management of the company’s mutual funds and affiliated portfolios, including property and casualty and life insurance products.

Calamos Investments CEO John Koudounis said: "Matt brings extensive expertise to a wide range of our existing portfolios and is already assisting us chart a course for the future as we address the evolving needs of clients worldwide.  We continue to execute on our mission to strengthen our existing capabilities and set the stage for new investment opportunities in key arenas."

Calamos Investments founder, chairman and global chief investment officer John Calamos, Sr said: "At Calamos, we have a long history of offering sophisticated, risk managed strategies in support of our clients' needs. Matt's contributions will help us to continue that legacy."