When you join us at MassMutual, you're joining a leading mutual life insurance company that is run for the benefit of its members and participating policyowners. Since our founding in 1851, we've had a single purpose: to help people secure their future and protect the ones they love. More than 170 years later, that commitment remains our guiding principle. Living mutual is at the core of who we are and it's the belief that guides everything we do.