Sir George served as the Minister for Trade, Industry, Agriculture and Tourism in the first post-independence government of St Lucia beginning in 1979.

Upon graduation, he joined the commercial sector, first as a clerk and later as a sales manager and accountant with leading business houses in Castries.

With his growing role in the public sector and the responsibilities of the city council and the legislative council, Mallet resigned from his post as accountant with Peter & Co. Now fully a public servant, Mallet was a member of the People's Progressive Party (PPP) and was appointed to the post of Minister for Trade, Industry, Agriculture and Tourism.

The UWP continued to win the subsequent national elections and pushed for full independence; the party's platform sharply criticised the British government's administration over the island.

Despite some civil unrest, Saint Lucia's transition to independence was one of the most peaceful in Caribbean history and the island maintains good relations with Great Britain.

Mallet did win the Castries Central seat in the election; but with the change of government he became a member of the opposition party in the Saint Lucia House of Assembly.

However, before leaving office, Mallet campaigned heavily for his chosen successor to the Castries Central seat, Dr. Vaughan Lewis.

Lewis, a former director of the Organisation of Eastern Caribbean States (OECS), won the Castries Central seat and assumed the office of Prime Minister on 2 April 1996.

However, with the SLP's election victory the next year, Sir George retired from the post of Governor General on 31 August 1997.