Alan Ferrier was born on May 26, 1894, in Madras, India.

He was a military engineer and served in both the Royal Engineers and the Royal Canadian Air Force (RCAF). Ferrier studied civil engineering at McGill University. He held several notable positions, including Director of Aeronautical Engineering for the RCAF, Air Marshal, and Air Member of the Air Council for Aeronautical Engineering. From 1952 to 1957, he served as Acting Secretary of the International Civil Aviation Organization. In 1919, he was awarded the Military Cross, and in 1945, he became a Companion of the Order of the Bath.

In 1922, he married Gladys Mary Roche (1894–1954). Later, he remarried Doreen Moon, known in the fashion world as Doreen Day. He died on June 26, 1971, in Montreal, Quebec.

Ford Cushing Smith was born on October 2, 1883, in Hancock, Delaware County, New York.

He was a civil engineer who he graduated from Princeton University in 1904. Shortly after, he became an instructor of civil engineering at the same university. Throughout his professional career, he worked for the Foundation Company on various projects, including the East River Tunnels and Municipal Buildings in New York City, as well as a power plant for the Aluminum Company of America in Massena, New York. He also contributed to several parkway and irrigation projects in Oregon.

From 1917 to 1923, he served as the resident engineer for M.P. and J.D. Davie Co. on a dry dock project in Lauzon, Quebec. His final position was with the New Hampshire State Department of Highways in Concord, New Hampshire.

In 1929, he married Katherine Sayers Ford (1896-1988). He died of a heart attack on November 30, 1955, in Hopkinton, Merrimack County, New Hampshire.