He served as a law clerk at the Supreme Court of Canada and worked in the Privy Council Office.
He is a lawyer and mediator by training, currently working at Stikeman Elliott.
[1][2] From his appointment, Dalphond sat as a member of the Independent Senators Group.
On May 21, 2020, Dalphond joined the Progressive Senate Group.
[3] Dalphond announced his intention to oppose use of the Emergencies Act during the "Freedom Convoy" protests, suggesting that it was a violation of section 8 of the Canadian Charter of Rights and Freedoms, which relates to "unreasonable search and seizure.