Gutenberg.
Invented movable type printing.
This also required in-home technical support for the users of his product.
The following is a very accurate depiction of one such service call.
I'm still doing some user support now.
We do media, and text content. Some of the questions the "user" was asking are SO current..That vid really cracked me up.
After 15 years working with computers, I am still regularly astounded that people with PHD's, high IQ's, and high saleries can be so ignorant of the
basic operation of a tool that they use almost every day.