Here one of Juan Pedro Serna's works.
In a personal way, my interest in the subject of "sketching" comes from my professional work as security instructor. Because of time constraints and choice of words, inaccuracy is inevitable. Why not avoid words? Why not report only the "big" idea? Why not use more images and less words? Visual thinking by skecthes was the solution. I became an active "sketchnoter".
You can see other Juan Pedro's sketchnotes on his website.
Wow, Juan Pedro, you cover very "thorny" topics!