"1967Z"^^ . . . . . . . . "Christopher Riley (born 1967) is a British writer, broadcaster and film maker specialising in the history of science. He has a Ph.D. from Imperial College, University of London where he pioneered the use of digital elevation models in the study of mountain range geomorphology and evolution."@en . "Riley, Christopher"@en . "1967-09-21Z"^^ . "British filmmaker" . . . . .