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Phillip D. Pack was an engineering geologist. During the 1960's and 70's he studied upper Dyeran fossils at Frenchman Mountain near Las Vegas, Nevada, with Henry B. Gayle.
Source
Hollingsworth, J. S., Sundberg, F. A., and Foster, J. R., (editors), 2011, Cambrian Stratigraphy and Paleontology of Northern Arizona and Southern Nevada: Museum of Northern Arizona Bulletin 67, 321 p.
Pack, Phillip D.; Gayle, Henry B. (1971). A New Olenellid Trilobite, Biceratops nevadensis, from the Lower Cambrian near Las Vegas, Nevada. Journal of Paleontology. 45, (5) 893-898. Retrieved from http://www.jstor.org/stable/1302786