He later graduated from the developmental services worker program at Cambrian College, and was hired as a behavioural consultant for the West Vancouver School Board in British Columbia.

[15] Along with other New Democratic Party MPs, he later called for an investigation into the Canadian Food Inspection Agency's handling of tainted milk that was sold in Sudbury and other parts of Ontario.

[18] The coalition was abandoned when Michael Ignatieff became Liberal Party leader, and decided to support the Conservative government's January 2009 budget.

[19][20][21] Finance Minister Jim Flaherty later announced that his government would launch an education campaign and provide for increased disclosure on credit-card statements, but would not regulate rates.

[27] Thibeault stood with striking workers from Vale Inco in the summer of 2009, and criticized Industry Minister Tony Clement's announcement that the federal government would not intervene to stop job and production cuts in Sudbury.

[28] He called for Clement's resignation after the minister stated that Vale had "saved Sudbury" from becoming a "Valley of Death" by purchasing Inco in 2006.

[31] In February 2011, Thibeault introduced Bill C-616, calling for a national strategy to reduce the incidence of serious injury in amateur sport.

[35] Following the resignation of Ontario NDP Sudbury Member of Provincial Parliament Joe Cimino, Thibeault announced on 16 December 2014, that he would be resigning as an NDP MP in order to run in the upcoming by-election in the provincial Sudbury riding as the Ontario Liberal Party's candidate after being appointed the party's candidate by Premier Kathleen Wynne.