Donald Leslie Johnson has written extensively for books and journals on Australian and American architectural history and American city planning history and is completing research on Romanesque architecture and on the education of Frank Lloyd Wright. He attended Louis I. Kahn's masterclass of 1960 at the University of Pennsylvania and was a member of the American Institute of Architects. He is an Adjunct Professor of Architectural History at the University of South Australia, has taught design and history in a number of American and Australian universities, and is an Honorary Fellow of the Australian Institute of Architects and currently resides in Kangarilla, South Australia.