In a nutshell: David W. Plummer is the original developer of Task Manager, one of Windows' most popular built-in tools for monitoring and managing system resources. David Plummer is working on a new Task Manager tool and is bringing it to macOS first. Simply named Task Manager OG (TMOG), the program is designed to offer a "serious" system console to people working on GUI-based operating systems. Plummer created Windows Task Manager during his tenure at Microsoft, coding the tool in his spare time before Windows NT lead developer Dave Cutler decided to integrate it into the platform. Most Windows users generally rely on Task Manager to get a closer look at the OS.