Senior Staff

Mary Guillette Harper, M.A., RPA

President and Owner

Director of Archaeological Research

As president of AHS and its nonprofit affiliate, PAST, Ms. Harper has extensive experience in cultural resource project management. She has directed over 600 projects in over 34 years with AHS and PAST. She holds an M.A. in Anthropology from the University of Connecticut, with concentrations in history, ethnography, and archaeology. She is a National Park Service 36 CFR 61-qualified prehistoric and historical archaeologist, historian, and cultural anthropologist, and she has extensive experience in industrial archaeology. Ms. Harper has special expertise in the history, archaeology, and ethnography of Native Americans and colonists in New England.

An expert in cultural resource management and environmental compliance, Ms. Harper oversees all archaeological projects and works with our senior archaeologists to develop and implement archaeological surveys. A working principal, Ms. Harper has written hundreds of technical reports and National Register nomination forms, along with the cultural resource components of over 100 environmental review documentations under Section 106, NEPA, Section 4(f) and state laws. She has also co-authored and authored books, articles, and text for websites and museum exhibits. She is a Registered Professional Archaeologist (RPA).


Bruce A. Clouette, Ph.D.

Senior Historian and Director of Historical Research

Dr. Clouette is a National Park Service-qualified historian, architectural historian, and industrial archaeologist. As the Director of Historical Research, he has over 35 years of experience with documentation of historic buildings and landscapes.

Dr. Clouette is also an expert in the evaluation and documentation of historic bridges, industrial and railroad structures, and waterpower and maritime features. He has produced hundreds of cultural resource management reports. He prepares cultural resource sections of environmental review documentation under Section 106, NEPA, Section 4(f), and corresponding state laws. He drafts memoranda of agreement for mitigation and, often as a component of mitigation, he has written and contributed to books on New England history, designed museum exhibits, and designed and written text for historic-themed websites.

A popular public speaker, Dr. Clouette frequently participates in public presentations. He holds a Ph.D. in history from the University of Connecticut, with a doctoral dissertation on Hartford’s immigrant population.


Ross Harper, Ph.D., RPA

Senior Historic Archaeologist

A National Park Service-qualified historical archaeologist, historian, cultural anthropologist, and curator, Dr. Harper is an expert in colonial-period history, archaeology, ethnohistory, and ethnography of Native and Euro-American peoples of the Northeast.

He holds an M.A. in Anthropology from the College of William and Mary, and a Ph.D. in Anthropology from the University of Connecticut. His doctoral dissertation was a study of human-animal relations among Native American people in the Northeast Woodlands during the historic period. Prior to joining AHS in 1995, he was a staff archaeologist at Colonial Williamsburg and the Mashantucket Pequot Museum.

Dr. Harper is responsible for designing and directing many of AHS’s historical archaeology surveys and data recovery projects, particularly those with 17th and 18th-century components. His work overseeing the excavation and analysis of colonial New England homestead sites is widely respected. He has authored dozens of reports and articles on historic-period archaeology in New England. He is co-author, with Dr. Clouette and Ms. Harper, of Highways to History: The Archaeology of Connecticut’s 18th-Century Lifeways. A Registered Professional Archaeologist (RPA), he is 40-hour OSHA HAZWOPER-trained at the supervisor level.


Sarah P. Sportman, Ph.D., RPA

Senior Archaeologist

Dr. Sportman holds a B.A. in History from Union College, an M.A. in Historical Archaeology from the University of Massachusetts Boston, and a Ph.D. in Anthropology from the University of Connecticut. Her dissertation, Halcyon Days: The Historical Archaeology of Community and Identity at Hammondville, New York, 1870-1900, focused on daily life in a 19th-century company-owned mining village. She is a National Park Service-qualified historian, historical archaeologist, prehistoric archaeologist, and cultural anthropologist, as well as a Registered Professional Archaeologist (RPA).

With over 15 years of experience studying the history, archaeology, and zooarchaeology of Euro-American and pre-colonial Native American cultures in New England and New York, Dr. Sportman has worked in both cultural resource management and academic settings. She has academic training in zooarchaeological methods and extensive experience analyzing faunal remains from pre-colonial and historic-period sites in New York and New England. She is the author/co-author of numerous technical reports on historic archaeological sites and of peer-reviewed articles on historic-period zooarchaeology, including: “Beyond Beef: Dietary Variability and Foodways at Hammondville, New York” in Anthropozoologica, 2014 and “Zooarchaeological Evidence for Animal Husbandry and Foodways at Sylvester Manor” in Northeast Historical Archaeology, 2007. Dr. Sportman has also managed and authored/co-authored technical reports on several large-scale pre-colonial investigations in coastal and northwestern Connecticut, Massachusetts, and Rhode Island.

Dr. Sportman is responsible for directing many of AHS’s archaeology surveys, particularly those involving community-focused archaeology, 19th-century, and urban components, as well as projects related to pre-colonial Native American archaeology. She is certified in hazardous waste operations and emergency response (HAZWOPER) for the investigation of archaeological resources in hazardous environments. Dr. Sportman serves on the Board of Directors of the Archaeological Society of Connecticut, is a member of the Conference on New England Archaeology steering committee, and is a frequent speaker at archaeological conferences.


David E. Leslie, Ph.D.

Senior Archaeologist and GIS Specialist

Dr. Leslie holds a B.A. in Anthropology and Sociology from West Virginia University, an M.A. in Anthropology from Florida Atlantic University, and a Ph.D. in Anthropology from the University of Connecticut. His dissertation, Stable Isotopic Evidence for Landscape Reconstructions, Kapthurin Formation, Kenya, focused on integrating stable isotopic evidence for past environments with archaeological, geological, and geomorphological data to reconstruct landscapes associated with Middle Pleistocene hominins.

Prior to working at AHS, Dr. Leslie was a staff archaeologist at the Mashantucket Pequot Museum, Research Scientist at the University of Connecticut, and Adjunct Instructor at Manchester Community College, the University of Connecticut, and Southern Connecticut State University. He is a National Park Service-qualified archaeologist, 40-hour OSHA-HAZWOPER certified, and serves as the firm’s Health and Safety Officer.

Dr. Leslie has over 10 years of geoarchaeological and environmental archaeological experience, collaborating on academic projects in the Northeastern United States, Kenya, and Europe. Dr. Leslie’s academic work has been published in anthropological and geological journals, integrating environmental, geological, and archaeological datasets. At AHS, he manages projects that involve significant components of GIS, geoarchaeological, and environmental data sets, such as our intensive study of the paleoenvironment of the Norwalk, Connecticut area.  


Marguerite Carnell, M.Phil.

Architectural Historian

Ms. Carnell brings additional expertise in architectural history and historic preservation to AHS as a National Park Service-qualified architectural historian and historian. Following her passion for design and architecture, she graduated summa cum laude from the University of Connecticut with a B.S. in Design and Resource Management. She went on to receive her M.Phil. in American Civilization from the George Washington University, with interdisciplinary studies in architectural history, material culture, religious history, and women’s history. She also completed coursework in architectural conservation at Columbia University.

With over 20 years of experience, Ms. Carnell has spent much of her career documenting, preserving, and restoring historic buildings and structures. She has worked on historic commercial and institutional buildings, mills, factories, houses, churches, theaters, schools, and bridges. Since joining AHS in 2014, she is responsible for researching and writing cultural resource management reports, historic resource surveys, environmental compliance reviews, National Register nominations, and historic tax credits.


Stacey Scheller Vairo, M.F.A.

Architectural Historian

Ms. Vairo is an architectural historian with an M.F.A. from the Savannah College of Art and Design and a B.A. in Art History from the University of Connecticut. She is a National Park Service-qualified historian and architectural historian. She has over 15 years of experience with all types of historic buildings and structures such as bridges, subway stations, tunnels, and power stations.

Prior to joining AHS, Ms. Vairo worked for eight years at the Connecticut State Historic Preservation Office as the National Register Coordinator and Deputy SHPO. She has extensive expertise in environmental review and compliance, identification and surveys of historic resources, National Register and state register nominations, historic structure reports, historic landscape reports, preservation plans, and mitigation plans throughout the Northeast.



Staff Archaeologists

AHS’s core staff of full-time field archaeologists specialize in southern New England. Most of our field crew has been with the firm for several years. Our low turnover is a key factor in quality and efficiency. Accustomed to working as a team with senior staff, our archaeologists accomplish work quickly and smoothly, with no downtime or duplication of effort.

Our staff of full-time archaeologists and historians is assisted by student interns and part-time/seasonal employees, who are always trained one-on-one by AHS staff to ensure that top quality is maintained.


Laboratory Staff

Our laboratory staff has extensive experience processing and curating New England artifacts. The inventory, conservation, and curation of artifacts at AHS are overseen by laboratory supervisor James Poetzinger and conservator Robyn Beausoleil.

Mr. Poetzinger supervises artifact processing in our wet and dry laboratories and oversees field archaeologists who are cross-trained as laboratory workers. He also maintains our site database.

Ms. Beausoleil, National Park Service-qualified conservator and curator, is responsible for implementing technical procedures in our dedicated conservation laboratory. She stabilizes fragile artifacts, assuring their long-term preservation, and oversees our curation facilities. AHS serves as both a temporary and long-term repository for artifact collections from Connecticut, Massachusetts and Rhode Island.