He was the proprietor and board director of dozens of corporations, including companies operating in finance, real estate, manufacturing, alcohol and retail.

His father Dr. Fortier, a friend of politician François-Sévère Désaulniers, initially practiced in Massachusetts before coming back to Saint-David where he became Mayor, Alderman, President of the commission on Catholic schools and French journal clerk of the legislative council, replacing Napoléon Legendre, grandfather of Maurice Roy, Cardinal and Archbishop of Quebec.

[6][10] He then became a partner of Senator and newspapers proprietor Jacob Nicol, also Treasurer of Quebec, Judge Wilfrid Lazure and lawyer J. S. Couture, who were also Batonniers of the Barreau de Saint-François.

[13][11] In 1928, Yale Fortier attended the banquet of Minister Joseph-Édouard Perrault, law partner of Sir Charles Fitzpatrick, Lt. Gov.

[16][17] Yale Fortier was a public speaker on Napoleon Bonaparte; a man he strongly admired for his love of France, and was covered in the newspaper La Presse.

[18] At the time of his discourses, he was Recorder (Judge) of Montreal-East, and saw Napoleon as a man oriented toward peace and progress, not after wealth, and envied by Russia and England for his military prowess.

[21][22][23] His other partner, lawyer Pierre Ledieu, was the nephew of politician Georges Duhamel, Solicitor General under Premier Honoré Mercier and supporter of patriot Louis Riel.

[27] In the same year, he founded with the same partners the Valois Lands Company, a real estate investment firm, with a capital stock of $90,000, and was made a board director.

[29] In 1915, he founded the Biltmore Realties Company, with lawyer Abraham Wilfred Muhlstock and accountant Jean Charles Duhamel, a real estate brokerage and investment firm, with a capital stock of $100,000.

[30] In 1916, he founded the Jewel Realty Company, with lawyer Abraham Wilfrid Muhlstock and accountant Jean Charles Duhamel, a real estate brokerage and development firm, with a capital stock of $100,000.

[37] In the same year, he cofounded the Style-Fit Cloack Company, with Lyon Levine, Henry Wienfield and Marcus Meyer Sperber, manufacturer and dealer in both wholesale and retail of ladies garments, with a capital stock of $10,000.