Key Theorist: Sylvia Walby 

Sylvia Walby is a British sociologist who is known for her work on gender, globalization, and social change. Some of her key arguments include:

1. Patriarchy: Walby argues that patriarchy, or the system of male domination, is a fundamental feature of society that shapes social relations and structures. She believes that patriarchy is reproduced through various social institutions, including the family, the state, and the economy. 

2. Globalization: Walby has argued that globalization has transformed the nature of patriarchy, creating new forms of inequality and exclusion. She contends that globalization has created a new international division of labor, in which women in the global South are disproportionately exploited and marginalized.

3. Gender Mainstreaming: Walby has been a proponent of gender mainstreaming, which is the integration of gender perspectives into all aspects of policy-making and planning. She believes that gender mainstreaming can help to promote gender equality and reduce social inequality.

Overall, Walby's work has been influential in shaping debates about gender, globalization, and social change. Her ideas continue to be relevant and influential for those seeking to understand the complexities of contemporary society and to work towards a more just and equitable future.