It's like asking who "authored" the internet. It was a collaborative effort of many people, organizations, and technologies.
If you're interested in specific individuals who were instrumental in MSN's development, you might want to research:
* Bill Gates: As Microsoft's founder, he oversaw the development of MSN and its strategic direction.
* Nathan Myhrvold: A prominent figure in Microsoft's early days, Myhrvold played a key role in MSN's creation and early growth.
* Brad Silverberg: A longtime Microsoft executive, Silverberg was responsible for the development of several key MSN services and products.
Ultimately, MSN's creation was a collective effort.