In the early 1920s, among Knight's great admirers was Dr. George Kunz, the renowned gemologist for Tiffany. Visiting Knight's studio, Kunz was struck by the fact that The Field Museum did not own any of Knight's work. Dr. Kunz worked with Knight's daughter Lucy, to secure a contract to create his biggest commission yet: a series of 28 murals to enclose the Museum's new fossil hall. The murals show the development of life on earth, from its earliest origins through the ages of amphibians, reptiles and mammals. Knight and Lucy traveled to Chicago in 1926 to begin the project. While in Chicago, Knight met the Museum's anthropologist Henry Field and accompanied him to France and Spain. The Field Museum mural project consumed four years of Knight's life, and remains today among the Museum's most popular treasures.