He was the main organizer for the
1959 Darwin Centennial Celebration held at the University of Chicago. He was an organizer, along with the National Congress of American Indians, including Native American organizer
Willard LaMere, of the 1961
American Indian Chicago Conference. He assisted in authoring the resulting Statement of Indian Purpose, the first major statement of the policy of tribal self-determination.
University of Chicago Tax intermittently served as Chair of the Department of Anthropology along with
Robert Redfield after the retirement of
Fay-Cooper Cole in the late 1940s. Cole had built up the Archaeology Laboratory Skeletal Collection, which began during the earliest iterations of the department in the late 1890s through the 1940s. The collection of human remains of both Indigenous and non-Indigenous people, bone fragments, and artifacts were compiled, studied, stored, and possibly exhibited on the campus. The skeletal collection contained human remains and archaeological objects taken and collected by faculty, students, curators, and donors through excavations of Illinois burial mounds such as the
Fisher Mounds,
Starved Rock,
Kincaid, Algeria,
Globe, Arizona, among materials from private donors. The collection also contained human remains from the University's Anatomy Department and Medical School. Donations accounted for a significant portion of the collection. Skeletal remains of 400 Indigenous people, as well as 10,000 bone fragments, stone, pottery and shell implements and artifacts largely excavated from Fisher and Adler Mounds, were donated in 1930 by George Langford, an engineer from Joliet who as also an amateur anthropologist, an honorary Research Associate in the Department of Anthropology at the University of Chicago, and later Curator of Plant Fossils at Field Museum. The politics of the department had changed with the faculty body, and Redfield and Tax determined that the Skeletal Collection no longer served the research purposes of the department, and the storage space could be better used. They tasked a graduate student in the department to inventory and report on the collection. The remaining skeletal materials do not account for extent of the historical collection; the department's report recommended that the majority be "dumped." The contemporary University of Chicago Archaeology Laboratory continues to hold non-Native American human remains, the paleoanthropology laboratory contains a large osteology collection. ==Honors==