He served as the Speaker of the Lok Sabha twice, President of the Inter-Parliamentary Union (1973–76)[3] and Indian High Commissioner to Canada (1980–82).

[6] In 1967 he was first elected to the Lok Sabha, the lower House of the Indian Parliament representing Tarn Taran parliamentary constituency.

The rare ability to quickly assess the mood of the House and a pragmatic approach helped him discharge the onerous responsibility of the office of the Speaker of the Lok Sabha in a dignified way.

Dhillon's election as the President of the Inter-Parliamentary Council of the IPU was at once a great honour for himself and also for the people and the Parliament of India.

[1]With Kartar Singh, he co-authored a series of eight children's books in the early 1970s entitled 'Stories from Sikh History'.