She became a vice-president of the company in 1995 and executive vice-president in 1999, until her appointment as president and chief executive officer.
From May 17, 2005 to February 6, 2006, she was the Minister of Human Resources and Skills Development and Minister responsible for Democratic Renewal in the government of Paul Martin.
After leaving politics, she served as the executive vice-chairman of Magna International, Canada's largest automotive parts manufacturer until December 31, 2010.
Currently she is the chairman and president of The Stronach Group and chairman of Acasta Capital.
She is also the founder and chair of The Belinda Stronach Foundation, a Canadian charitable organization.
Stronach is an honorary Patron of the Southlake Regional Health Centre and a former honorary chair of the Magna Hoedown.
In 2003, she received one of Canada's oldest and most distinguished awards, the Beth Shalom Humanitarian Award, presented in recognition of outstanding achievement in humanitarian service.
Though he held no formal operational role during that time, Frank Stronach remained as Chairman of the Board.
As a CEO, Stronach was widely viewed as more conciliatory to organized labour than her father, who was noted for his strong opposition to unions at Magna.
In February 2001, she was appointed chief executive officer of Magna, succeeding Donald J.
Walker (who became CEO of Magna spinoff Intier Automotive Inc.), and in January 2002, she also became its president.
While head of Magna, she ceased fighting the United Auto Workers in a dispute before the National Labor Relations Board, and the union organized numerous Magna workers in the United States.