Gibbon began his career in 1938 when he became the President of the
All-India Anglo-Indian Association in Hyderabad. In 1941, Gibbon worked in the
Government of India's Food Department in Punjab and later became the president of the Anglo-Indian community's Punjab chapter. The main reason for Gibbon's support for Pakistan was the promise of separate electorates (see
Communal Award) for
Christians, thereby freeing the Anglo-Indians from the dominance of the
Hindu majority. Gibbon was a member of the first and second
Punjab Assemblies and the
National Assembly, participating in debates on various legislative matters. He was the lone non-Muslim representative from
Punjab in the
Second Constituent Assembly, and alongside
Peter Paul Gomez of East Bengal, were the only Christian members in that body. He also served as the
Deputy Speaker of the National Assembly of Pakistan and advocated for separate electorates for minorities, especially displaced Christian families. However, Prime Minister
Huseyn Shaheed Suhrawardy passed the Electoral Amendment Bill of 1957, formally abolishing separate electorates for non-Muslim
minorities of the country. He remained as the Speaker of the National Assembly until 1958, when he retired from politics on being accused of corruption. Following the imposition of
military rule under
Ayub Khan, Gibbon emigrated out of the country. ==References==