[2] McGrath is currently serving as the principal secretary to federal NDP leader Jagmeet Singh in the House of Commons.

[7] She has also served as a board member and social issues chair of the Elizabeth Fry Society, Vice-President of National Action Committee on the Status of Women, and a member of the Steering Committee for the Canadian Feminist Alliance for International Action: Beijing and Beyond.

[8] McGrath is a frequent commentator on national media broadcasts and has been identified as one of the 100 most influential people in government and politics in Ottawa.

In the 1984 federal election, while a student, she ran as candidate for the Communist Party of Canada in Edmonton—Strathcona,[10] placing seventh.

[citation needed] As Chief of Staff to Jack Layton (2008–2011), she is credited with professionalizing caucus operations and with helping organize the party's historic breakthrough to Official Opposition status.

[citation needed] McGrath also served as the National Director of the New Democratic Party (NDP) of Canada (2014-2015).