"A Pattern Language: Towns, buildings, and construction" written by Christopher Alexander, Sara Ishikawa, Murray Silverstein, Max Jacobson, Ingrid Fiksdahl-King, and Shlomo Angel, and published in 1977, is the largest selling book on urban design. In addition to Alexander: https://en.wikipedia.org/wiki/Christopher_Alexander, where are the pattern language's co-authors? Are they still doing pattern language related research or designs?