Images (public domain and/or Creative Commons https://creativecommons.org/licenses/by-sa/2.0/deed.en):
Jordan Peterson: https://www.flickr.com/photos/199491548@N07/53318393034/
Elon Musk: https://commons.wikimedia.org/wiki/File:USAFA_Hosts_Elon_Musk_(Image_1_of_17)_(cropped).jpg
Robert Greene: https://commons.wikimedia.org/wiki/File:Robert_Greene_B%26W.jpg / https://www.flickr.com/photos/88088424@N08/8052329908/