Benjamin Barna, Ph.D.


Dr. Barna is a senior archaeologist for the ASM Hawai‘i office. He earned his Ph.D. in Anthropology from the University of Nevada in 2013, and his dissertation focused on the evolution of the Hawaiian ranching community in the 19th and 20th centuries. Dr. Barna has 9 years of professional archaeological experience and has worked on a variety of projects throughout Hawai‘i Island, Nevada, California, and Arizona. His professional duties have included inventory and reconnaissance surveys, excavation, site recordation, construction monitoring, GIS, literature searches, historical research, technical report write-ups, Section 106 compliance, and artifact identification, analysis, and cataloguing. He has taught anthropology and archaeology classes at University of Nevada, Reno, and Truckee Meadows Community College in Reno, Nevada. Dr. Barna formerly served as a Surface Warfare Officer in the U.S. Navy.

Brian Williams, M.M.A., RPA


Brian Williams received his B.A. in Anthropology from the University of San Diego, and his M.A. in Maritime Archaeology from Flinders University, Australia. His field experience includes projects in Italy, Australia, the Hawaiian Islands, as well as survey, monitoring, records searches, excavation, and technical reporting on projects in California. Mr. Williams has taught a university course in Gender and Anthropology at the University of San Diego, and his primary research focus involves understanding social identity and its constructions through archaeology. Mr. Williams is currently managing ASM’s work under an on-call contract for archaeological services to SDG&E.  He is also serving as ASM’s Project Manager for survey, testing, and monitoring services for construction of renewable energy projects in San Diego, Imperial and Riverside Counties.

David Iversen, M.A., RPA


Mr. Iversen has 16 years of experience in cultural resource management in the Pacific Northwest Coast, Plateau, Great Basin, and southern California. He has supervised and conducted archaeological field reconnaissance, testing and data recovery excavations, construction monitoring, and laboratory analysis. He has worked closely and successfully with Native American Tribal members, government agency representatives, construction personnel, and environmental management professionals. Mr. Iversen is the lead author of more than 25 cultural resource management technical reports, and has co-authored more than 50 technical reports. He has analyzed the lithic, ceramic, and shell artifacts, as well as the marine invertebrate remains, for several archaeological projects, and written portions of technical reports documenting the results of analyses. Most recently, he has conducted a series of survey and monitoring projects for the U.S. Army Corps of Engineers (Corps) and U.S. Department of Fish and Wildlife (USFWS) in Washington State. Mr. Iversen currently manages ASM’s Stanwood, Washington office as Principal Investigator and Project Manager.

Don Laylander, M.A.


Mr. Laylander has 35 years of professional experience in archaeological fieldwork, research, and cultural resource management throughout California. He earned his M.A. with a thesis synthesizing and evaluating data on the prehistory of Baja California. In 67 monographs and articles and 33 unpublished conference papers, he has discussed and contributed to diverse approaches for reconstructing and interpreting the prehistory of the Californias, integrating ethnographic and linguistic as well as archaeological sources of information. His professional duties have involved carrying out scores of archaeological surveys, as well as supervising, conducting, analyzing, and reporting archaeological evaluation and data recovery excavations, preparing compliance documents for Section 106 of the National Historic Preservation Act (NHPA) and the California Environmental Quality Act (CEQA), overseeing and managing archaeological contracts, and assisting in the development of agency cultural resource policy guidelines.

James Daniels, M.A., RPA


Mr. Daniels has eight years of experience in CRM and two years of experience in academic lab and field research. After completing his Bachelor’s degree, he volunteered at the North Carolina Office of State Archaeology until acquiring a permanent position with a cultural resources consulting firm located in Chapel Hill, North Carolina. In 2008, Mr. Daniels began working for ASM and continues to employ his knowledge of archaeogeophysics as a Senior Archaeologist for ASM. He has performed geophysical surveys of a historic cabin on Caples Lake, an ethnohistoric settlement associated with the San Luis Rey Mission, the historic roadside Carl Inn in Yosemite National Park, and multiple prehistoric sites on MCB Camp Pendleton. Mr. Daniels has also refined previously collected data and written detailed analytical reports on the results of previous geophysical investigation projects. Mr. Daniels also employs portable X-ray fluorescence (pXRF) in ceramic sourcing projects, soil analyses, and analyses of groundstone artifacts.

Matthew Clark, B.A.


Mr. Clark is a senior archaeologist for the ASM Hawai‘i branch, and has 17 years of professional archaeological experience. He has worked on projects throughout the Hawaiian Islands (Hawai‘i Island, Maui, O‘ahu, and Kaua‘i), and has also participated in projects in Vermont, California, Iowa, New Jersey, and Anguilla. Mr. Clark earned his in Anthropology from the University of Vermont in 1998. Well-versed in all aspects of archaeology, Mr. Clark has extensive experience in all aspects of project and laboratory management, including, but not limited to inventory and reconnaissance surveys, preservation planning, burial treatment planning, data recovery, site testing, excavation, archaeological monitoring, feature restoration, artifact identification and cataloguing, site recordation, GIS, community consultation, record searches, historical background research, Section 106 compliance, and technical report write ups. Mr. Clark is currently pursuing his M.A. in Heritage Management at the University of Hawai‘i at Hilo.

Montana Long, M.S.


Mr. Long has 11 years of experience conducting professional and academic archaeological research. He received his M.S. in Anthropology from the University of Oregon in 2007. Mr. Long has been involved in dozens of prehistoric and historic survey, site testing, data recovery and GIS data management projects in Oregon, Nevada, Idaho and southern California. In July of 2009, Mr. Long was appointed Manager of GIS and Graphics for the Reno office. In this position, his responsibilities include overseeing the production of all maps and graphics included in CRM reports and in DPR or IMACS site forms for all projects in the Reno office, as well as assisting the other offices on an as-needed basis. He produces maps for use by crews in the field and supplemental maps that facilitate project design and field access. He is also responsible for gathering and maintaining an extensive library of background GIS data, managing all project-related GIS data and conducting post-field analysis of GIS data gathered during surveys and excavations.

Sarah Stringer-Bowsher, M.A., RPH


Ms. Stringer-Bowsher has nine years of professional experience as a historian. She earned her M.A. through public history course work in historical research methods, applied history, museology, and historic preservation. As the Senior Historian for ASM, Ms. Stringer-Bowsher focuses on developing research-based historic contexts, which is the essential foundation for both architectural history and historical archeology site assessments and evaluations. In addition to creating local, project-specific histories and historic contexts, Ms. Stringer-Bowsher prepares land use histories for a multitude of applications including ESA Phase I site assessment reports and cultural resource site assessments. Ms. Stringer-Bowsher also prepares historic resource evaluations of buildings, structures, and objects in compliance with CEQA, NEPA, Section 106, and local registers.

Shannon Mahoney, Ph.D., RPA


Ms. Mahoney has over 15 years of experience in professional archaeology. Her technical expertise centers on historical archaeology, bioarchaeology, and public engagement. She has served as a field archaeologist for both private and non-profit consulting firms and has served as a field supervisor for academic and compliance projects. Ms. Mahoney has considerable experience with Section 106 and Section 110 requirements of the National Historic Preservation Act in California, Nevada, and Virginia, as well as California Environmental Quality Act (CEQA) requirements. She has worked on survey, testing, and data recovery projects under the review of the Bureau of Land Management, National Park Service, Army Corps of Engineers, Department of Defense (Army and Navy), and the California Department of Transportation.

Shelby Castells, M.A., RPA


Ms. Castells has seven years of experience in all manners of professional archaeology in southern California and Virginia. She earned her B.A. degree in Anthropology from the University of California, San Diego in 2003, and received a M.A. in Anthropology with a concentration in Archaeology, at San Diego State University in 2010. Her interests focus on historical archaeology and regional history and prehistory of southern California. She has been involved with numerous survey, monitoring, testing, and data recovery projects within the City of San Diego and the counties of San Diego, Imperial, Orange, Los Angeles, Riverside, San Bernardino, and Kern, as well as in the Puget Sound region of Washington and the Chesapeake region of Virginia. Ms. Castells serves ASM as Senior Archaeologist.

Teresa Gotay, M.A.

Teresa O

Ms. Gotay is a Senior Archaeologist at the ASM Hawai‘i branch, and has 15 years of diverse education, training, and professional experience. She has worked on projects on Kaua‘i and Hawai‘i Island, and has also participated in projects in Arizona, Louisiana, New Mexico, and Texas. Ms. Gotay earned her B.A. degree in Anthropology from Tulane University in 2004 and her M.A. degree in Anthropology from Texas State University in 2010. Ms, Gotay has developed comprehensive knowledge of archaeological field methodology, laboratory techniques, and technical writing from her professional and academic pursuits. Her archaeological field experience includes management of field crews, linear and block surveys, data recovery, test unit excavation, mechanical trenching, monitoring, and cultural informant interviews. In addition to archival background research and artifact curation. She is also an osteologist with over a decade of specialized experience in the location, recovery, and analysis of human remains from prehistoric, historic, and modern contexts in various stages of decomposition during cemetery relocation projects, and various excavations. She is well-versed in the estimation of biological profile, as well as the interpretation of trauma, pathology, and taphonomic processes.