You use things he worked on everyday, one of them is UTF-8. He also designed and implemented UNIX. He was creator of B language, thanks to which we have C language. He also worked on Golang and Plan9.
The Simplex algorithm, the transistor, C and C++, the R programming language, the ccd, the mobile phone...
Just some from the top of my head
OOP, Ethernet, the mouse, GUIs, and tablets were some of the things invented at Xerox PARC.
That's not something I'd brag about... ;)