The Hershey Company and Mars Inc. dominate the same market but the iconic founders of these companies had different visions and left different legacies. M. S. Hershey left a community named after him and one of the largest foundations in the world. Frank C. Mars left one of the largest private companies in the U.S. and a small family worth $94 billion. This chapters gives an abridged history of both companies and highlights some of the reasons for their success. It looks at the key individuals and how they structured and operated their commercial enterprises. It also considers the charitable organizations and foundations they started and the impact they have had on their communities and beyond. This chapter includes a head-to-head comparison of the Hershey Company and Mars Inc. in four areas: Business, philanthropy, personal lives of the founders, and legacy. And it points out where each company illustrates the distinctives of the tandem hybrid social enterprise and offers takeaways for entrepreneurs and social entrepreneurs.