Geoffrey Teignmouth Clarkson, FCA (October 23, 1878 – June 22, 1949) was a Canadian accountant and auditor known for his expertise in banking audits and corporate rescue.

[1] He was the son of Edward Roper Curzon Clarkson, a notable Canadian accountant and insolvency receiver, and Amy Boydell Lambe.

[2] His mother was a grand-niece of John Boydell, her father and grandfather were Wine Merchants and purveyor to King George III and farm landlords to Arthur Young (agriculturist).

[5] His family owned William Mulock's former home at 71 Avenue Road, nearly a quarter of Toronto Island (of which Geoffrey's father surveyed).

The firm's training and practices, particularly those of Clarkson, have been used as foundations for modern insolvency and bankruptcy law in the country.

Politicians at public hearings in Ottawa called him the “bank undertaker” for his reputation for acting as liquidator for defaulted banks and had made such an indelible impact on Conservative Party men through his dutiful service to Government on various royal commissions and crown corporation audits that he was once recommended as minister of finance, made the first external auditor of the Bank of Canada, and asked to help the war effort by helping stabilize monetary policy.

Toronto's Hush magazine claimed in the 1930s that GT was known as "Jesus Christ" amongst the Provincial Conservatives in Queen's Park.

[13] GT's opinion was deemed critical when drafting the Banking Act 1923 and no changes to the legislation when in committee were to be made without his approval.

Her father, American, was a descendant of Canadian senator Ebenezer Washburn Perry[20] and other united empire loyalists from Vermont.

One of his brothers, Edward Guy, was awarded the Military Cross in May 1917 after venturing into Battle of Passchendaele no man's land for 21 hours retrieving the dead and wounded.

In the 1916 edition of The Canadian Annual Review of Public Affairs by J. Castell Hopkins, Hopkins noted that “one of the remarkable features of this war was the patriotism evoked amongst the well-known or prominent families of Canada”, Edward Guy and Maurice Arundel are both listed amongst the names of “well-known families over the length and breadth of Canada” who were represented on War service.

[28] Both Walter and Frank argued that they were simply “the effects of rum rations on exhausted bodies and over-wrought nerves”.

[29] Probably because of the early exposure to the botany and physical sciences at the Model School, GT and his younger brother Guy each took a keen interest in gardening and in nature.

The long hours in wilderness watching and shooting and classifying birds would never fail to reconstitute GT's spirits.

Bird watching and ornithology were hobbies of Willie, whom Amy Clarkson called GT's kinsman namesake.

Robert Curzon was a Major in the Royal Regiment of Canada, his younger brother served in wartime procurement.

GT, like his father, provided the accounting and auditing services of the firm to non-profit and charity organisations, particularly educational institutions free of charge.