Pearson joined the Department of External Affairs (now called Global Affairs Canada) in 1952, being the second of three members of his family to serve in Canada's diplomatic service. His father was Secretary of State for External Affairs and his son, Michael, would be a senior civil servant.[1][2]
In late 1983, Pearson was appointed as a special representative for arms control to then-Prime MinisterPierre Trudeau, and in 1984 he was seconded to the Canadian Institute of International Affairs. In January 1985, he was appointed as the first executive director of the Canadian Institute for International Peace and Security, where he served for six years. In 1996, his book Seize the Day was published, chronicling his father's diplomatic legacy. Pearson was a past president of the United Nations Association in Canada. In 2000, he was made an Officer of the Order of Canada.[1]
Pearson died in Ottawa, Ontario, on March 18, 2008. He was survived by his wife, SenatorLandon Pearson (served 1994–2005), and their five children—Patricia, Michael (former diplomat and official with Fisheries and Oceans Canada), Hilary, Anne, and Katherine.[5]