Meet our team

My objective is to support our clients in achieving their personal and financial goals while providing them with peace of mind.

Serge Duhaime has over 40 years of experience in the financial services sector. He holds a bachelor’s degree in economics and is accredited as a wealth management advisor and portfolio manager. He is also a Fellow of the Canadian Securities Institute (CSI). A father of three, he enjoys running, sailing, skiing, and canoeing. He serves on the board of the Fondation Santé Outaouais and is Chair of the Investment Committee. He also holds the designation of Certified Corporate Director (ASC). In Québec, this designation is reserved for individuals who have graduated from the university-level corporate governance certification programme of the Collège des administrateurs de sociétés.

Wealth Advisor and Portfolio Manager, David Plamondon is a professionally trained financial planner with over 20 years of experience in the financial services industry. In addition to a background in accounting, he holds an MBA in Financial Services and is a Fellow of the CSI. A father of three, he is passionate about skiing and cycling. He has also been actively involved with his neighbourhood scout group for several years.

Costa Mpiana joined the Team Duhaime at National Bank Financial in February 2019 as a Wealth Associate. He supports the team on the administrative side and in the follow-up of client meetings. Costa obtained a Bachelor of Commerce degree with an option in finance from the University of Ottawa.  He also assists clients with their concerns with commitment and dedication. He loves sports in general and is passionate about soccer.

Mathieu O’Toole joined National Bank Financial in September 2025 as an Associate, after having worked for several years at National Bank as a Banking Advisor. He is responsible for ensuring the smooth operation of the team’s day‑to‑day activities while delivering exceptional client service. Mathieu holds an advanced diploma in Business Administration, with a specialization in Accounting, obtained from Algonquin College, and is currently completing the Canadian Securities Course. In his free time, Mathieu is an avid sports enthusiast, particularly passionate about hockey and golf.