Linus Torvalds is the inventor and lead developer of Linux kernel, the core of the operating system we all know and use today under various shapes and sizes: PCs, Android, Chrome OS and others. At the beginning of the project, the first Linux kernel occupied only 65 KB. Today, even a regular Linux kernel contains over 10 million lines of source code. Nearly 12,000 developers from more than 1,200 companies have contributed to the Linux kernel since tracking began 10 years ago.”]
Source: https://www.bitdefender.com/blog/hotforsecurity/ten-facts-you-might-now-know-about-linux/