Arthur Dalgety Bridges was born in Sydney, New South Wales, in 1901, the son of schoolteacher Frederick Bridges and Ivy May Campbell. After being educated at Fort Street Boy's High School, Bridges worked for his brother on a citrus farm near Yenda, New South Wales. After qualifying as an accountant in 1924, Bridges rose to be a Fellow of the Institute of Chartered Accountants in Australia (FCA) and a Fellow of the Chartered Institute of Secretaries. Bridges also became established in his own firm, Bridges and Steel (later A.D Bridges & Co). Becoming recognised as a leading financial adviser, Bridges served as a director of numerous companies in a variety of areas.^[1] He married Rachel Duckworth on 2 November 1929 and had a daughter and a son.

A committed Presbyterian, Bridges would eventually become treasurer of Presbyterian church of New South Wales and a National Councillor from 1927 until 1932. Through this, Bridges joined the conservative United Australia Party and its successor, the Democratic Party. As a councillor in both parties, Bridges was a member of the committee which established Liberal Party in 1945–46. Initially serving as a councillor, Bridges rose to be New South Wales vice-president and a Federal Councillor from 1946 until 1965.^[1]

Bridges was elected to the indirectly elected New South Wales Legislative Council on 14 March 1946 and took his seat on 23 April 1946. Bridges eventually replaced Hector Clayton as Liberal leader in the Council in 1962, thereby becoming Leader of the New South Wales Opposition in the Legislative Council. He served thus until May 1962, when Liberal leader Robert Askin led the Liberal/Country Coalition to victory at the 1965 election. As the now Leader of the Government in the Legislative Council, Bridges was sworn into the cabinet as Vice-President of the Executive Council and as Minister for Child Welfare and Social Welfare.

While in parliament, Bridges was vice-president of the Royal Blind Society an honorary secretary of Blinded Ex-serviceman's Club, a committee member of Red Cross Blood Transfusion Service, the vice-president of Young Men's Christian Association and a fellow of Senate of University of Sydney from 1967 until 1968.^[2] Bridges served in government until his death in office aged 66 on 22 May 1968. On his death, Premier Askin noted that he had "an apparently inexhaustible energy which was a source of wonder to all who knew him" while the leader of the opposition Labor Party, Pat Hills, lamented: "Of all the sad occasions which have come upon this venerable House of Parliament, none was so universally felt as the news of the death of our late colleague".^[3]