2001 February 12, InfoWorld, volume 23, number 7, page 69:
Understand at-will employment At-will employment gives the company and the employee the right to terminate the relationship for any reason, and is recognized, with limitations, nationwide.
2017, Steven L. Emanuel, Emanuel Law Outlines for Property:
How the at-will tenancy arises: The parties could create a tenancy at will expressly, by agreeing that either may terminate at any time. But generally, such a tenancy is created by implication.