Clifford Geertz was an influential American anthropologist known for his approach of "thick description" to understand cultures. He argued that culture consists of webs of meaning understood through interpreting symbols, actions, and artifacts within their social contexts. Geertz used ethnographic fieldwork and semiotic analysis to develop thick descriptions that untangled the complex conceptual structures of other cultures. His interpretive approach aimed to understand cultures from the perspective of the people within them rather than imposing outside frameworks.