David Bradley wrote the code for one of the most well-known key combinations around: Ctrl+Alt+Delete.

CtrlAltDelete

Bradley, 55, is getting a new start of his own. He’s retiring Friday after 28.5 years with IBM.

Bradley joined the company in June 1975 as an engineer in Boca Raton, Florida. By 1980, he was one of 12 working to create the IBM PC. He now works at IBM’s facility in Research Triangle Park.

To know about his code click here