The Multicultural History Society of Ontario (MHSO) is a not-for-profit educational institution and archives located in Toronto, Canada.
Professor Harney, a renowned scholar in the field of migration and ethnic studies, served as the MHSO's Academic Director from its establishment until his death in 1989.
The MHSO is the creator of an extensive collection of archival materials which document immigrant and ethnic experiences in Canada.
Assisted by ethnic and indigenous associations and community researchers, the Society undertook oral history interviews, and collected historical photographs and personal and institutional textual records during the first decades of its operation.
In the early 21st century, as a result of these efforts, more than 50 ethnocultural communities and First Nations, and some 240 municipalities in every region of the province are represented in the MHSO's archival holdings.