I made the Harold infographic in 2010 while teaching at the Upright Citizens Brigade Theatre in NY and it was since adopted by the UCB Training Center and used by improv students all over the world.
I get more emails about this than anything else I’ve designed. You don’t need my permission to use it, post it online, or print out a personal copy, but please, do not alter or sell it.

If you want to buy a print for your home or theater, I sell print-on-demand through society6.com (my cut is minimal, most goes to the service). It comes in many sizes framed and unframed.

I updated the infographic in 2014 to include two color variations and added co-ordinating graphics for several other improv forms: The Documentary, La Ronde, and the Eventé.