Ada, Countess of Lovelace, 1840: https://commons.wikimedia.org/wiki/File:Ada_Lovelace_portrait.jpg

Father Roberto Busa: stephenramsay.us/2011/08/11/father-roberto-busa/; http://www.neh.gov/divisions/odh/grant-news/roberto-busa-november-13-1913-august-9-2011

Ted Nelson gives a presentation on Project Xanadu for SuperHappyDevHouse at The Tech Museum of Innovation on February 19th, 2011: https://commons.wikimedia.org/wiki/File:Ted_Nelson_cropped.jpg

Douglas Engelbart, 1968 giving "The Mother of All Demos" (image source: Doug Engelbart Institute): http://www.dougengelbart.org/history/engelbart.html

Susan Hockey defining a font on the VT15 31.10.72. Rutherford Appleton Laboratory & the Science and Technology Facilities Council (STFC): http://www.chilton-computing.org.uk/acl/associates/permanent/hockey.htm

Georg Christoph Lichtenberg-Haus der Technischen Universität Darmstadt. Bildquelle: Katrin Binner, TU Darmstadt.