Ms. Marcoux is Chair of the Board of Transcontinental Inc., a printing, flexible packaging and publishing company, a position she has held since 2012. She was Vice-Chair of the Board from 2007 to 2012 and Vice-President, Corporate Development, from 2004 to 2012.

Between 1997 and 2004, Ms. Marcoux was Director, Mergers and Acquisitions, as well as Director, Legal Affairs and Assistant Corporate Secretary. Before joining Transcontinental, she was a lawyer at McCarthy Tétrault LLP.

Ms. Marcoux is also a member of the boards of George Weston Limited and Rogers Communications Inc.

Since November 2015, she has served as a director of the Montréal Children's Hospital Foundation. She was Co-Chair of the Centraide of Great Montréal's campaign in 2016 and she will serve as Chair of the Major Donors' Circle starting in 2018. She has been actively involved in a number of fundraising campaigns for organizations such as the Montreal Mayor’s Foundation for Youth, the Montreal Museum of Fine Arts, Young Musicians of the World and Tel-Jeunes.

In 2017, Ms. Marcoux was inducted into the Women's Executive Network (WXN) Hall of Fame. In 2014, she was named to the list of Canada’s Top 50 Business Leaders by Power & Influence magazine. In 2010, 2012 and 2016, Ms. Marcoux was a recipient of Canada’s Most Powerful Women: Top 100^TM award in the Corporate Executives category, awarded to the country’s highest achieving female executives. In 2010, she was named Personality of the week by La Presse and Radio-Canada in recognition of her outstanding career.

Ms. Marcoux holds a Bachelor’s degree in Political Science and Economics, and a Bachelor’s degree in Civil Law, both from McGill University. She has been a member of the Québec Bar since 1995.