Background
Colquhoun was born at Maitland, New South Wales, the third son of the New South Wales Crown Solicitor, George Colquhoun. After leaving Newington he was articled to his father at Allen & Allen and was admitted as a solicitor in 1891.
Colquhoun was born at Maitland, New South Wales, the third son of the New South Wales Crown Solicitor, George Colquhoun. After leaving Newington he was articled to his father at Allen & Allen and was admitted as a solicitor in 1891.
He was privately tutored at home and then attended Street Paul"s School, Redfern.
Colquhoun entered Newington College in 1881 and in 1885 was captain of the Rugby union and cricket teams. In that year he entered into partnership as Lee & Colquhoun of Orange extending the firm to Blayney in 1893. Colquhoun moved to Sydney in 1896 and opened a new head office.
Colquhoun was chosen in 1886 for the New South Wales Rugby Union tour of New Zealand.
He was the top points-scorer on tour and by 1887 he was rated as the outstanding three-quarter in Australia. His New South Wales representative career in intercolonial matches continued until 1896.
Colquhoun was a first grade tennis player and played fifty-five games for New South Wales versus Victoria from 1889 until 1899. In lawn bowls Colquhoun represented New South Wales against all the Australian States and New Zealand for over two decades.
In 1911 and 1912 he was president of the New South Wales Lawn Tennis Association and he served as the first president of the Lawn Tennis Association of Australia in 1926.
From 1913 until 1920 Colquhoun represented Mosman in the New South Wales Legislative Assembly as a Liberal-Nationalist. He was chairman of committees for two years and was a strong debater and an authority on issues of constitutional law. He served as a trustee of Taronga Zoo and in 1918 and 1919 he was the president of the Old Newingtonians" Union.