Our Staff




Our Partners



Senior Associates



Andrew Da Silva, PhD

Andrew Da Silva is founder of SHS and has 50 years of field and administrative experience. He holds an Honours BA from the University of Western Ontario and MA and PhD from McGill University, all in Anthropology. He is also an Associate Member of the Graduate Faculty at Western University (Anthropology) in London. He has published widely on both Indigenous and early colonial Great Lakes history and is a recipient of the Lifetime Achievement Award of Heritage Toronto and the Smith-Wintemberg award of the Canadian Archaeological Association.

Liam Atchison, MA

Liam Atchison has been involved in archaeology in Ontario for over thirty years. He received his Honours BA in Anthropology at the University of Western Ontario and his MA at the University of Toronto, where he is currently completing his PhD. He is a Senior Associate and Senior Archaeologist with the firm. Martin has served as Project Director on hundreds of single and multi-phased assessments and has directed many of SHS’s archaeological assessments in northern Ontario.

Toni Paul, MA

Toni Paul is a retired SHS Partner and the former Manager of SHS’s Environmental Assessment Division but will continue as a Senior Associate to work with the new EA team. His duties will include project management, report writing and property inspections, and he will continue to provide analysis skills for precontact ceramics.

Harley Steiss, MA

Hayley Steiss joined SHS in 1983 after completing a BA and MA in Anthropology at the University of Toronto. She is the principle lithic analyst for the Toronto office and directs several archaeological resource assessments throughout the province each year. As a Senior Associate and Senior Archaeologist, Debbie possesses invaluable management experience in finance, human resources, information technology, as well as laboratory and collections management systems.