After the death of John Smith Archibald (1872-1934), the practice was continued by his eldest son, Ian Thurston Archibald (1903-71), Hugh P. Illsley (1896-1992) and John A. Currie. In 1937 the firm's name was changed to Archibald & Illsley.

For further information, see the CAC's publication, John S. Archibald and His Associates: A Guide to the Archive =John S. Archibald et ses associés: Guide du fonds. Montreal: Canadian Architecture Collection, Blackader-Lauterman Library of Architecture and Art, McGill University, 1990. Also see Irene Puchalski. An Analysis of Four Building Types by John S. Archibald, Architect (1872-1934). M.A. Thesis. Montreal: Concordia University, 1991.

Après le décès de John Smith Archibald (1872-1934), son fils aîné lan Thurston Archibald (1903-1971) s'est associé à Hugh Percival Illsley (1896-1992) afin de poursuivre la pratique avec Hugh Percival Illsley (né en 1896) et John A. Currie. En 1937, le cabinet d'architectes prit le nom de Archibald & Illsley.

Pour plus de renseignements, veuillez consulter la publication de la CAC intitulée John S. Archibald and His Associates: A Guide to the Archive = John S. Archibald et ses associés: Guide du fonds, Montréal : Collection d'architecture canadienne, Bibliothèque Blackader-Lauterman d'architecture et d'art, Université McGill, 1990. Voir aussi Irene Puchalski. An Analysis of Four Building Types by John S. Archibald, Architect (1872-1934). Thèse de maîtrise. Montréal: Université Concordia, 1991

Sir Adams George Archibald was born on May 3, 1814, in Truro, Nova Scotia, the son of Samuel and Elizabeth Archibald.

He was a Canadian lawyer and politician, and a Father of Confederation. Although he first wanted to become a doctor, he dropped the profession in favour of law and was called to the bar of Nova Scotia in 1839. He established a practice in Truro and sought a variety of public offices in order to promote his legal business.
He was first elected to the provincial assembly as a Liberal in 1851, one of two members for Colchester County. While in the legislature, he helped to establish a normal school at Truro in 1854, becoming one of its directors. His first office was as solicitor general in 1856, a posting that was cut short by the collapse of the Liberal government. After the Liberals regained power in 1859, he was appointed attorney general. He was also on the committee of negotiators for the Intercolonial Railway in 1862.
When Joseph Howe became imperial fisheries commissioner later that year Archibald acted as government leader until the Conservatives won the 1863 election. He was then invited by Charles Tupper to be one of the delegates to the Charlottetown Conference on the union in September of 1864. He also participated in the conferences at Quebec and London As the financial expert of the delegation, it was Archibald's task to justify the financial arrangements of the Quebec Resolutions to Nova Scotians. In fact, he was the only Liberal in the Nova Scotia Assembly to support the Resolutions. For his efforts in promoting Confederation in the province, he was made secretary of state for the new Canadian federal government in 1867. He resigned the post the following spring in the face of Nova Scotian opposition to union but returned to the federal government in 1869 after winning a by-election in Colchester County.

Archibald's speeches regarding the people of the Red River area led George-Étienne Cartier to offer him the position of lieutenant-governor for the newly created province of Manitoba, and of the Northwest Territories. in 1870. Archibald accepted, on the condition that the posting only be for one year and that he receive an appointment to the Nova Scotia Supreme Court when his term was complete. While in Manitoba, he established the foundations for many basic services, such as school and court systems, and negotiated the first two treaties with the western First Nations. Archibald was knighted for his work in the new province.

When his appointment to the court was delayed, Archibald accepted a position with the Canadian Pacific Railway Company. He was made judge in equity in 1873, but only days later was asked to accept the post of lieutenant-governor of Nova Scotia, after James William Johnston resigned. He held the office until 1883. While it was less eventful than his term in Manitoba, he had to meet the challenge of working with politicians still opposed to Confederation.

In October of 1883, Archibald participated in the inauguration of Dalhousie Law School. The following year, he was asked to lead the campaign for expansion and reorganization of the entire university and was made chairman of its board of governors. Archibald also participated in the founding of the Nova Scotia Historical Society in 1878, serving as the organization's president from 1886 until his death.

In 1888, John A. Macdonald asked Archibald to run in a federal by-election in Colchester County. He carried the seat easily but gave no speeches in the House of Commons, and was too sick to run again in 1891.

In 1843, he married Elizabeth Archibald Burnyeat. He died on December 14, 1892, in Truro, Nova Scotia.

Charles Dickson Archibald was born on October 31, 1802, in Truro, Nova Scotia.

He was a lawyer, businessman, and political figure in Nova Scotia. He graduated from Pictou Academy in 1822 and continued to study law in his father's office (Samuel George William Archibald) in Truro. In 1826, he was elected to the Nova Scotia Assembly representing Truro Township. In 1830, he became a chief clerk and registrar for the Supreme Court of Newfoundland, but he resigned this post in 1831. In 1832, he married Bridget Walker, heiress to the Rusland estate in Lancashire, England, and spent most of the remainder of his life in England. In 1840, Archibald was the first Nova Scotian to be accorded the honour of becoming a fellow of the Royal Society of London. He retained close ties with Nova Scotia and frequently visited the province, helping to raise funds to develop an iron mine near Londonderry, Nova Scotia. In 1851, he attended a conference in Toronto regarding a railway linking the Maritimes to Upper and Lower Canada. He filed numerous patents while in England but was made bankrupt shortly before his death in London in 1868.

Sir Edward Mortimer Archibald was born on May 10, 1810, in Truro, Nova Scotia.

He was a British diplomat, a lawyer, and an officeholder active during the transition to responsible government in the colony of Newfoundland. His father Samuel George William Archibald was a lawyer and attorney general for Nova Scotia. Archibald studied law in his office and was admitted to the bar of Nova Scotia in 1831. The same year he was appointed chief clerk and registrar of the Supreme Court of Newfoundland, replacing his brother Charles Dickson Archibald in that position. By 1833 Archibald was an acting assistant judge of the Newfoundland Supreme Court. He also took on the additional job of the chief clerk of the Newfoundland General Assembly. In 1857, Archibald served as British consul to New York, a position he held for twenty-six years until his retirement in 1883. From 1871 he also undertook the additional responsibility of acting as British consul-general for New York, New Jersey, Delaware, Rhode Island, and Connecticut.

In 1834, he married Catherine Elizabeth Richardson. One of their daughters, Edith Jessie Archibald was a Canadian suffragist and writer. He died on February 8, 1884, in Steyning, Sussex, England.

A native of Montreal, Edward Achibald received his M.D., C.M. from McGill University in 1896. After post-graduate work in France, Germany and England, he joined the staff of the Royal Victoria Hospital in 1904 as Assistant Surgeon. He was Major in the Canadian Army Medical Corps during World War I and it was at the McGill General Hospital in Boulogne that he developed new techniques in the treatment of war wounds especially those to the lungs. In 1923 Archibald became a Senior Professor of Surgery at McGill University, and in 1939 was named Surgeon-in-Chief of the Royal Victoria Hospital. In the Second World War he served as a consulting surgeon to the Directorate of Medical Services in Ottawa, and at the time of his death was working on a book about war wounds.

Born in Montreal, Ian Thurston Archibald was the son of the eminent architect John S. Archibald who played an influential role in the development of his career. He attended the Montreal High School and worked in his father's office during each summer from 1921 to 1928 while attending courses in the Department of Architecture at McGill University. He graduated from McGill in 1928 and in that year joined his father as a draftsman where he remained for two years until 1930 when he undertook to represent the firm in Vancouver on the site of the new Hotel Vancouver being erected by the Canadian National Railway. He returned to Montreal in early 1934 and upon the death of his father in March of that year established the firm of John S. Archibald Associates in collaboration with Hugh P. Illsley and John A. Currie who had been working in the office since 1927. In April 1937 the firm was renamed Archibald & Illsley. Works they produced include Macy's Drug Store and Dining Room, Sherbrooke Street West at Victoria Avenue in Westmount, 1938; a cabin for Ian T. Archibald, in Montebello, Quebec, 1939 ; a residence for Thurston D. Archibald, Upper Belmont Avenue, 1940; a new Parish Hall for St. George’s Anglican Church, Stanley Street, 1945; and Postal Station B, University Street at Cathcart Street, 1949-50. The Art Deco design for the flagship store of the F.W. Woolworth Co. on Ste. Catherine Street West in 1938 was among their most striking designs. The partnership flourished and in late 1949 they were joined by Frances O. Templeton The firm was dissolved after 1970, and Ian T. Archibald died in Montreal the following year.