Patrick H. Armstrong is Adjunct Associate Professor, Edith Cowan University, Western Australia.Patrick H. Armstrong taught Geography and Ecology at the University of Western Australia. He has written extensively on the life and work of Charles Darwin. Brought up in the university city of Cambridge, among Armstrong's earliest recollections was seeing Darwin's granddaughter painting pictures of the River Cam.Geoffrey Martin is Distinguished Professor Emeritus (Geography)at Southern Connecticut State University in New Haven, and Archivist of the Association of American Geographers.