Dionne-Marsolais went at the Université de Montréal and obtained a bachelor's degree in economics and a master's degree in econometrics. She later became an economist at Hydro-Québec and was an assistant to the company's president. She was also the vice-president in the development sector for the Société générale de financement. After being the Quebec delegate in New York, she was an economist for Price Waterhouse.
She entered politics in 1994 and was elected in Rosemont in 1994. She held several Cabinet positions including tourism (1994–1996), culture and communications (1994–1995), industry and trade (1996–1997) and revenue (1998). After being re-elected in 1998, she was named minister for revenue (1998–1999) and natural resources (2001–2003). She was also a member of several committees and a delegate member for relations with several world regions including the Middle East and Brazil.
While the Parti Québécois lost the 2003 elections to the Liberals, she was re-elected for a third term in 2003 and for a fourth term in 2007. In late October 2008, she announced her retirement from politics becoming effective when the general elections were announced on November 5, 2008. Former Minister Louise Beaudoin is the PQ candidate.[1]
