Landmark’s principals and associates have more than twenty years of highly specialized experience in conducting traditional knowledge and traditional land use and occupancy studies, effects assessments and land use planning.

Our team members have a high level of commitment, enthusiasm, and experience to bring to the needs of First Nations communities, proponents, and regulators. We have worked with First Nations throughout B.C. and have participated in projects in Alberta, Yukon and Northwest Territories.


Kevin Twohig

A consulting archaeologist since 1987, Kevin gained significant archaeological and managerial experience as the senior staff archaeologist and operations manager responsible for a large British Columbia-based consulting company. Kevin is a Registered Professional Consulting Archaeologist (RPCA) and member in good standing of the B.C. Association of Professional Archaeologists (BCAPA). He has held British Columbia Heritage Conservation Act permits since 1992 and established Terra Archaeology Limited in the spring of 2002.

Dan Weinberger

Dan Weinberger has been involved in consulting archaeology since 1989. He was a senior staff archaeologist and project manager responsible primarily for managing archaeological survey projects for a large B.C.-based consulting company from 1994 until starting Terra Archaeology Limited in the spring of 2002. He is a Registered Professional Consulting Archaeologist (RPCA) and was a Director of the BC Association of Professional Archaeologists (BCAPA) from 2003 until 2005. He has held British Columbia Heritage Conservation Act permits.


Brooke Barber

Brooke has been employed in cultural resource consulting since 2014 and is actively involved with all stages of the projects she works on, from budget creation and scoping, to final reporting. Brooke has worked for 4 years as an assistant project manager and is currently a project lead for research and lands office support projects. With a background in anthropology and First Nations studies at UBC, Brooke holds a strong understanding of the Indigenous cultures of the B.C. interior, northwest coast, and southern Northwest Territories. Brooke is experienced in archival research, lands and resource advisory and technical support, regulatory consultation, and has co-authored many traditional land use study and cultural heritage assessment reports.


Thomas ‘Tad’ McIlwraith

Landmark’s senior ethnographer Tad McIlwraith has over 18 years of experience as a cultural anthropologist in academic research and professional consultation services. Tad conducts ethnographic research into the activities and stories of subarctic Indigenous hunters and is increasingly working with Secwepemc (Shuswap) communities on the British Columbia interior plateau. Tad works as a consulting anthropologist with First Nations communities throughout British Columbia and northern Alberta on projects related to land use planning, local and family history, and traditional knowledge.

Kim Dertien-Loubert

As Senior Anthropologist, Kim has over 22 years of academic and professional experience, including a focus on Indigenous relations with the Crown, Indigenous Knowledge and resource management, and socio-cultural issues such as health, welfare, gender, and identity. Her experience includes federal government work with the Canadian Heritage and Archaeological Services Branch Parks Canada, the Litigation Management Branch, and specific claims research for Indian Residential Schools Resolution Canada. She has worked as the environmental and lands management arm for a progressive First Nation, an advisor to the Province of Alberta for a multi-stakeholder non-profit environmental organization, and professional consultant for First Nation and Métis organizations. Over the last 10 years, her work has been in northeast Alberta, on Métis, Cree, and Dene traditional territories focusing on the assertion of Aboriginal rights, interests, cultural sustainability, and stewardship of traditional lands and resources.

Claire Marshall

Claire has 25 years of experience specializing in Aboriginal engagement and community development. She has over fifteen years of experience working in the natural resources sector including for BC Hydro, BC Transmission Corporation, TransCanada Pipelines, Teck Resources and the First Nation Energy and Mining Council. Her experience in the energy and mining sectors has been focused on meaningful First Nation consultation, Aboriginal procurement strategies, capacity development and relationship building activities for First Nations and corporations.

Sandra Peacock

Sandra Peacock is Landmark’s senior ethnobotanist and is considered an expert with theoretical and methodological specialization in issues of plant resource intensification, and the emergence of complex hunter-gatherers and first farmers. She is currently appointed as an associate professor of anthropology at the University of British Columbia’s Okanagan campus and teaches several courses including Biological Anthropology, Archaeology of Native North America, Ethnobotany, and Paleoethnobotany.