From the February 20th article "Remembering Doug Henning, superstar illusionist turned politician" by ey Tong in the Toronto Star:
Seven “Doug Henning’s World of Magic” TV specials aired throughout the late ’70s and early ’80s, helping to make Henning a household name. He also made guest appearances on “The Tonight Show” with Johnny Carson and “The Muppet Show.”
Despite his enormous success in the US, Henning always considered Canada his home and was proud to tell people that he was Canadian, Nancy says. He returned often to visit family and to do the occasional performance. “He was always pleasantly surprised by the reception,” Nancy says. When their mother was diagnosed with cancer, he spent several months caring for her in Toronto.