Saskatoon Bonli returned to Saskatoon and worked at Clark's Interior Furnishings for four years while giving evening classes in art. Bonli participated in the first
Emma Lake Artist Workshop in 1955, and in subsequent workshops in 1956, 1957, 1962, 1963, and 1965. At these workshops he studied with
Jack Shadbolt,
Joseph Plaskett,
Will Barnet,
Clement Greenberg,
Kenneth Noland,
Jules Olitski, and
Lawrence Alloway. In 1957, he taught the young Joan Anderson at
Saskatoon Technical Collegiate. She would later be better known as the singer
Joni Mitchell. Then aged thirteen, she had planned to take lessons from the well-known landscape and figurative
Ernest Lindner, but he was on sabbatical that year. Bonli found her an argumentative pupil. In 1957 Bonli founded Bonli Interiors in Saskatoon. It first occupied James Art Studio and then moved to premises on the lower floor of the King George Hotel that had been vacated by the Mendel Art Gallery. The firm provided interior design services and the store sold gifts and bath accessories, imported Scandinavian furniture and window coverings. Bonli soon began to also undertake residential and commercial work in Regina, where he had a full-time representative. In 1958 Bonli appeared on a weekly
CTV television show with Margaret Dallin, and then on a show with
Sally Merchant called
Here Comes Sally. He also took summer courses at the
Parsons School of Design in New York City. In New York, Henry and his wife Elsa became friends of the critic
Clement Greenberg. Bonli was an admirer of New York abstract expressionists such as
Barnett Newman. He was encouraged by the art collector Fred Mendel to exhibit his work. He participated in shows at the Mendel Art Centre and the Dunlop Gallery in Regina. Bonli was a member of the Saskatchewan Arts Board and the Saskatchewan Society of Artists. He was vice-president of the Saskatoon Art Centre. He was an art consultant for the Saskatoon School System for three years, and was Assistant Curator at the Coste House art centre in Calgary. He held a one-man show at the
Mendel Art Gallery in 1965.
Toronto Bonli moved with his family to Toronto in 1965 where they opened Bonli Gallery, selling art and furniture. Later he opened two more stores, both called "Henri The Second", which sold factory over-runs and designer furnishings. In 1966–67, Joni Mitchell would often stay rent-free at Bonli's Toronto studio over Rugantino's restaurant on Yonge Street, with her husband Chuck Mitchell, and at times was babysitter for the Bonlis' daughter Jane. The Bonlis considered that Chuck was the better singer of the two, and would be the one to succeed. By this time Bonli had become a reasonably well-known painter. Bonli continued to return to Saskatoon to execute interior design commissions. In 1974 he sold his interior design company and devoted himself to painting. Henry Thomas Bonli died at St. Michael's Hospital, Toronto, on 16 May 2011. He was aged 83. ==Exhibitions and collections==