carriers/products: carriers list Northwestern Mutual Aetna Blue Cross Blue Shield Celtic Insurance Company Cigna Coventry Delta Dental Fortis GE Financial Guardian Life Insurance Hartford Insurance Group Jefferson Pilot Financial MetLife Principal Financial Group Reliance Standard Standard Insurance Company United Healthcare Affiliated with the Maryland office of the Northwestern Mutual Financial Network. ©2008 Strategic Employee Benefit Services is a nationwide marketing program providing employee benefit services exclusively through Northwestern Mutual Financial Network Representatives. Northwestern Mutual Financial Network identifies the sales and distribution arm of The Northwestern Mutual Life Insurance Company, Milwaukee, Wisconsin.