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Zygmunt Bauman, one of the most prominent and prolific European sociologists of recent decades, has died. He was 91.

The Polish-born left-wing thinker's works explored the fluidity of identity in the modern world, the Holocaust, consumerism and globalization.

Bauman died at his home in Leeds, England, on Monday surrounded by his family, according to Anna Zejdler-Janiszewska, a Warsaw-based philosophy professor and friend of Baumna's who was informed of his death by his wife.

Renowned for an approach that incorporated philosophy and other disciplines, Bauman was a strong moral voice for the poor and dispossessed in a world upended by globalization. Whether he was writing about the Holocaust or globalization, his focus remained on how humans can create a dignified life through ethical decisions.