Guarantee Trust Life Insurance Company has a long history of operating on the values of integrity, quality products and perso ... nal customer service. Founded in 1936, GTL is a legal mutual reserve company located in Glenview, Illinois, which provides a portfolio of competitive health, accident, life and special risk insurance programs. GTL has benefited from the ongoing direction of three generations of the Holson family – father to son to grandson. Their experience and leadership has given the company a consistent and clear vision of who we are and where we’re going. read more