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Our Cultural Resource specialists can help you manage the risk of impacting important historic or archaeological places.

Welcome to Brad Slaughter

Please join me in welcoming Brad Slaughter to Orbis. Brad has over 12 years of experience managing projects and conducting floristic inventories, vegetation sampling, surveys and mapping of rare plants, invasive plants, and plant communities, and ecological threat assessments. He has expertise in the classification and description of plant communities and is coauthor of A Field Guide to the Natural Communities of Michigan. Brad serves on the Michigan Rare Plant Technical Advisory Committee and managed Michigan’s Natural Heritage Database of rare vascular plant element occurrences for several years. He also coauthored the most recent iteration of Michigan’s Floristic Quality Assessment. In addition to his extensive writings, Brad regularly delivers presentations and field trips for a variety of audiences. He also participates in wildlife surveys, including surveys for federally threatened and endangered species such as the Mitchell’s satyr butterfly, Karner blue butterfly, Poweshiek skipperling, eastern massasauga, and Kirtland’s Warbler.

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Tessa M. Aby-Kruger

Botanist

Tessa is a geologist, botanist and vegetation ecologist with over 10 years of experience managing and conducting projects, specializing in ecological and floristic inventories, rare plant surveys, and vegetation monitoring. She also performs wetland evaluations and is a guided hike leader.

Jeremy Sheets

Senior Wildlife Biologist, Vice President

Jeremy is a founding member of Orbis and directs its ecological and wildlife surveys, assessment and planning services, and brings over 20 years’ experience conducting various wildlife surveys with a focus on bat ecology and urban wildlife management.


Jeremy has managed wildlife projects for private firms and the public sector including for wind facilities, pipelines, roadways, military bases, and airports. Jeremy is proficient in wildlife management/control techniques, wildlife identification, threatened and endangered species, and surveying and analysis techniques for mammals, birds, reptiles, amphibians, fish, and insects. Jeremy is a Federal Aviation Administration (FAA) Qualified Airport Wildlife Biologists who develop Wildlife Hazard Assessments (WHA) and Wildlife Hazard Management Plans (WHMP) for airports. Jeremy is qualified to inspect erosion, sediment and stormwater plans, and their implementation. Furthermore, Jeremy is federally permitted to conduct endangered bat surveys in USFWS Regions 3, 4, 5, and 6 and includes acoustic surveys, mist-netting, and radio telemetry.

J Ryan Duddleson​

Senior Archaeologist, Principal

Ryan is a founding member of Orbis and directs its cultural resource management services, and brings over 20 years’ experience helping clients assess and minimize the risk of impacting places with cultural value.


Ryan works with public sector clients including federal, state, and municipal government, as well as private firms in energy, transportation, industrial, and development sectors. He also coordinates with agencies and consulting parties involved with the National Environmental Policy Act, Section 106 of the National Historic Preservation Act, and other related cultural resource laws and regulations. He performs archival research, analysis, and excavation. Ryan also has experience in artifact and archival curation. He has applied innovative techniques to traditional artifact analysis, such as examining organic residues from prehistoric pottery to determine prior contents. Ryan also has experience with human remains in archaeological settings. Ryan meets the Secretary of the Interior’s Standards and Guidelines for Archaeology and Historic Preservation, 48 FR. 44716 and is a Qualified Professional Archaeologist in Indiana, Illinois, Iowa, Michigan, Ohio, Pennsylvania, and Wisconsin.