McConnell quietly set about becoming one of his country's greatest philanthropists. He shunned publicity, and his own newspaper was never allowed to mention any of his charitable donations. To aid in the treatment of
cancer, he purchased a
cobalt 60Co therapy machine for the Imperial Cancer Campaign, and he donated them to the
Jewish General Hospital, the
Hôpital Notre-Dame, the
Hôtel-Dieu de Montréal, and the
Hôtel-Dieu de Québec in
Quebec City. In 1937, McConnell founded the McConnell Foundation. A major benefactor of McGill University, McConnell served on the Board of Governors for 30 years (1928–58). He gave the university Purvis Hall in 1942, Chancellor Day Hall (
James Ross mansion) in 1948, the McConnell Brain Imaging Centre at the
Montreal Neurological Institute in 1952, and the McConnell Winter Stadium in 1956. In 1959, he donated the funds to build the McConnell Engineering Building, which doubled the number of engineering classrooms and offices, and in 1961, built Presbyterian College (Morrice Hall). After his death, the McConnell Foundation undertook the 1971 renovations to the
McCord Museum. During
World War II, after the United States
Lend-lease program was launched in March 1941, fellow Canadian businessman
Max Aitken, the then volunteer British
Minister of Aircraft Production, asked McConnell to help finance the training of pilots, such as
Jackie Cochran in the
United States, to ferry American-built aircraft across the
Atlantic. McConnell donated $1 million for the "Wings for Britain" campaign and in recognition of his contribution, a flying squadron was given his name. In the 1940s and 1950s, McConnell contributed money to build the following Boys, later
Boys and Girls clubs. Service clubs and community groups participated in appropriate fundraising as well. 1949 Rosemount Boys Club. Followed by the 1950 East End Boys and Girls Club(Maisonneuve district) followed in short order by the Point St. Charles Boys and Girls Club in the Point, Unity Boys and Girls Club, in lower Westmount bordering on St. Henri, Dawson Boys and Girls Club in Verdun, plus one in Trois - Rivières. McConnell's benevolent works extended to individuals such as
Maureen Forrester, who recounted in her biography how he had learned of the difficulty she was experiencing holding down a job while trying to develop her singing career. He contacted her and offered to cover her expenses for three years so she could train professionally — on the condition she never reveal his name. A patron of the
Montreal Symphony Orchestra, in the early 1960s, when the orchestra was preparing to move to new facilities at
Place des Arts, McConnell purchased the 1722
Laub–Petschnikoff Stradivarius violin for use by concertmaster and violinist
Calvin Sieb. ==Death and legacy==