Sienna Senior Living, Inc. engages in owning and managing seniors’ living residences. It also offers independent living, assisted living, long-term care, and specialized programs and services. It operates through the Retirement and Long-Term Care (LTC) segments. The Retirement segment refers to the locations in province of Ontario and RR management services business. The LTC segment includes LTC residences and management services business. The company was founded in 1972 and is headquartered in Markham, Canada.