He became involved in the Labour and Co-Operative movements, and in 1914 was elected to Wood Green Urban District Council.

After the 1924 general election, he served as Parliamentary Private Secretary to the then Leader of the Opposition Ramsay MacDonald,[2] continuing to serve as Parliamentary Private Secretary to the Prime Minister after MacDonald's elevation to the Premiership.

On 15 November 1945, shortly after he had been re-elected at the 1945 general election, he was ennobled as Baron Morrison, of Tottenham in the County of Middlesex.

[1][3] In 1946, Morrison was appointed as a member of the Anglo-American Committee of Inquiry seeking a policy to resolve the increasing conflict between Jews and Arabs in Palestine.

[citation needed] Morrison married Grace Glossop in 1910, and the couple had two sons.