The notable figure known for their significant contributions to gender studies is Judith Butler. A philosopher and gender theorist, Butler's influential works, particularly "Gender Trouble," challenge traditional notions of gender and sexuality. She argues that gender is not fixed, but rather a performative construct shaped by societal norms. Butler's theories have profoundly impacted feminist theory and activism, urging a more nuanced understanding of identity and gender fluidity. Her contributions have paved the way for ongoing discussions in queer theory, intersectionality, and social justice movements.