Final answer:
Franz Boas developed the four-field approach in American Anthropology, emphasizing the integration of biological anthropology, archaeology, cultural anthropology, and linguistic anthropology.
Step-by-step explanation:
The four-field approach in American Anthropology was developed by Franz Boas. Boas was an influential anthropologist who emphasized the integration of the four fields of anthropology: biological anthropology, archaeology, cultural anthropology, and linguistic anthropology. He believed that a holistic approach, combining insights from these different fields, would lead to a deeper understanding of human societies and cultures.