Roger Fisher was an American lawyer, professor, and negotiation expert, best known for his work in conflict resolution. He co-authored the influential book, Getting to Yes, which introduced the concept of principled negotiation, emphasizing the importance of mutual interests over positional bargaining. Fisher's ideas have been widely adopted in various fields, including business, law, and international diplomacy. Fisher was a professor at Harvard Law School and co-founded the Harvard Negotiation Project, which aimed to improve negotiation strategies and techniques. His contributions have had a lasting impact on how individuals and organizations approach negotiations and resolve conflicts effectively.