Charpentier was born on May 14, 1935, in Ottawa, Ontario, Canada, the second youngest of his father, Fulgence Charpentier's, six children. Fulgence Charpentier had his four eldest children with his first wife, who died. Fulgence remarried to his second wife, Louise Dionne, shortly afterwards. The couple had their two youngest children, including Jean Charpentier. Fulgence Charpentier, who had worked as a journalist covering the Parliament of Canada, was the acting Mayor of Ottawa at the time of Jean Charpentier's birth. Fulgence Charpentier worked for the Canadian federal government as a diplomat and wartime censorship director during World War II. His father was posted to the Canadian embassy in Paris, under Georges Vanier in 1948, and was the first Ambassador to African francophonie, based in Cameroon, beginning in the 1960s. Fulgence Charpentier died in 2001.
Charpentier became Trudeau's press secretary at a time of increased friction between the Prime Minister and the Canadian media. Trudeau severely disliked the press corps, who had developed a reputation for confronting parliamentarians in the hallways of Parliament with difficult questions. The Prime Minister's communication director, Richard O'Hagan, moved Trudeau's press conferences to the Government Conference Centre to better fit the Prime Minister's image. As press secretary, Charpentier headed the Prime Minister's press conferences at the Conference Centre. He won the respect of the press corps by balancing the competing interests of the print and broadcast media, and, more importantly, the French and English-speaking reporters. He made sure that the same number of French speaking reporters from Quebec were called upon as the larger English-speaker contingent of reporters. It is believed that Charpentier had Trudeau write a public letter announcing his separation from his wife, Margaret Trudeau, in 1977, declaring the marital problems as a private matter.
Later life
In 1979, Trudeau's government was ended by the oppositionProgressive Conservatives, led by Joe Clark. Charpentier became a communications consultant at the Treasury Board. The Canadian government asked Charpentier to arrange the official papal visit by Pope John Paul II to the country. He spent the rest of his career as a freelancetranslator. In 1990, he married Mary Mackay. Jean Charpentier died from cancer on January 8, 2010, in Ottawa at the age of 74. He was survived by his wife, Mary Mackay, and her four children, Tina, Dwayne, Shawn and Derek. He was survived by three siblings - Claire, Louise and Jacques - and predeceased by two brothers, Pierre and Georges.