Massachusetts Mutual Life Insurance Co. has appointed Jonathan Matta as regional managing director for the Midwest, responsible for sales and growth of the MassMutual Funds in the defined contribution investment only (DCIO) marketplace, the firm announced Tuesday.

Matta’s appointment brings MassMutual’s DCIO sales and support team to 10 members. The DCIO team partners with MassMutual’s 80 managing directors to support sales of bundled retirement plans.

Before joining MassMutual, Matta was a sales director for Janus Capital Group for more than 10 years, responsible for sales and business development.