SPRINGFIELD, Mass., April 25, 2012 /PRNewswire/ -- MassMutual's Retirement Services Division continues to lead the industry with its unmatched worksite guidance program. With over 25 retirement education specialists (RESs) located throughout the country, MassMutual is uniquely positioned to conduct personalized guidance interactions with more than 100,000 retirement plan participants in 2012, up from 65,000 in 2011.