Matlab, Alan Turing, Apl, Linear Algebra, Kdb.
https://commons.wikimedia.org/wiki/Category:Kenneth_E._Iverson#/media/File:KEI_with_ATW_NY_Aug_1989.png). See the wiki photo for a younger Kenneth Iverson Both Stephen and Arthur were more than eager to point me to their fantastic online historical archives, succinctly summarized elsewhere by my