Who is are the father of open-source OS?

The father of open-source operating systems is considered to be Richard Matthew Stallman. He is a computer scientist, free software movement activist and founder of the Free Software Foundation (FSF). Stallman started working on the GNU Project in the early 1980s with the aim of creating a complete free software Unix-like operating system. This led to the development of the GNU Operating System, and ultimately, to the creation of the Linux kernel. Stallman's work and commitment to free and open-source software has made a profound impact on the software industry and has inspired countless others to contribute to the development of open-source operating systems and software.