Am I still bound by my employment agreement under NY law once my written contract expires?

As a threshold matter, this question inherently assumes that your contract doesn't contain a provision whereby the contract is automatically renewed absent a specific, written notice of intention to terminate the agreement. That said, assuming there was no such automatic renewal, New York law provides that the agreement will be deemed automatically renewed if the parties act as if the agreement were still in effect. For additional information on this topic, please see "What Happens When Your Employment Contract Expires in New York."