Judith Butler is a prominent philosopher and gender theorist known for her work on the concepts of gender and identity, particularly through the lens of feminist and queer theory. Her influential ideas argue that gender is not a fixed attribute but rather a performative act that individuals enact based on cultural norms, challenging traditional notions of biological sex versus cultural gender roles. This perspective has significant implications for understanding LGBTQ+ identities across different cultures and how societal constructs shape individual experiences.