[3] Kappe remained actively involved in architectural theory and practice in his later years, particularly in the areas of sustainability and the prefabrication of residences.
He studied for a single semester at UCLA in 1945 before being drafted in into the U.S. Army Corps of Engineers, where he served as a topographical surveying instructor.
[7] Kappe designed multiple houses in California and elsewhere, he put emphasis on making homes functional in their climate and site through use of technology and local materials.
[9][10] The Ray Kappe Archive is housed at the Getty Research Institute and contains all of his drawings, models, and papers, offering comprehensive coverage of his long and varied career.
[7] The Showtime series Californication features one of Kappe's projects, the Benton House, as a major plot point in Episode Seven, "Girls Interrupted.