sentences:  His research focused on the archaeology, ethnography, and paleoecology of the Pacific Islands.He carried out original field research in Papua New Guinea, the Solomon Islands, the Loyalty Islands, Kingdom of Tonga, American Samoa, Yap, Belau, the Marshall Islands, the Cook Islands, French Polynesia (Mangareva, Mo'orea), and Hawai'i.Kirch retired from the Berkeley faculty in July 2014, becoming Chancellor's Professor Emeritus and Class of 1954 Professor Emeritus of Anthropology and Integrative Biology.