He was a specialist in Old World Archaeology and took interest in the ethnology and linguistics pertaining to Bosnia and Croatia.

In 1984, he contributed a chapter to the book The Sasquatch and Other Unknown Hominoids, which he also edited with Grover Krantz.

"[2] Anthropologist Kathleen J. Reichs wrote that the book failed to provide a scientifically rigour analysis of the physical evidence for unknown hominoids and is "riddled throughout with typographical and grammatical errors.

"[3] She concluded that the book is unsatisfying from the point of view of physical anthropology but is worth reading for providing insight into non-mainstream interpretations of hominid evolution.

[3] Biologist Debra A. Oleksiak commented that apart from a few exceptions "there is no critical evaluation of the sources and the accuracy of the data" and noted that many of the papers in the book "do not reflect an understanding of biological processes or evolutionary thinking".