The Richardsons' more recent work has diversified beyond classification and crystallography. In the 1980s they stretched into the fields of synthetic biochemistry and computational biology as pioneers in the de novo design of proteins, a reverse engineering approach to make and test theoretical predictions about protein folding. In the 1990s the Richardsons developed the kinemage system of molecular graphics and David Richardson wrote the Mage program to display them on small computers, for the then-new journal Protein Science. Additionally, they developed all-atom contact analysis (see image) to measure "goodness of fit" inside proteins and in interactions with surrounding molecules. The Kinemage website offers interactive exploration of various 3D protein structures through computer displays using their Mage or KiNG graphics programs. Funded by a National Institute of Science (NIH) grant, the website is often used as a teaching tool. Textbooks and internet sites that have sourced images from Kinemages include "Introduction to Protein Structure" by Branden & Tooze, "Fundamentals of Biochemistry" by Viet, Voet & Pratt, "Principles of Biochemistry" by Horton et al., and the University of Mississippi's Kinemage Authorship Project.