Margaret Gilbert is a prominent philosopher known for her work in social philosophy and the philosophy of action. She is particularly recognized for her theories on collective responsibility and the nature of group agents. Her influential ideas have contributed significantly to discussions in both ethics and political philosophy. Gilbert has authored several important texts, including On Social Facts and A Theory of Political Obligation. Her work often explores how individuals relate to groups and the implications of these relationships for moral and legal responsibility. Through her research, she has shaped contemporary understanding of collective decision-making and accountability.