The retirement services arm at Massachusetts Mutual Life Insurance has hired Eric Wietsma to be vice president of investment services.

Wietsma previously managed the public retirement plan business at Hartford Financial Services Group Inc., Hartford.

MassMutual, Springfield, Mass., also has hired 4 investment consultants: Phil Connor, Bruce Picard, Rob Milas and Doug Steele.

All of the consultants hold the Chartered Financial Analyst professional designation, MassMutual says.