Born in Montreal in 1973 of Vietnamese parents, Hoang grew up in Brossard, Québec.
In 1998 he joined an international law office which took him to work in Vietnam, Singapore and Hong Kong before returning to Montreal in 2001. Since 2002 he has been a notary in private practice.
Hoang studied science and economics before completing his Bachelor’s degree in law and a Master’s degree in international private law from the Université de Montréal. He then continued his training in international law in The Hague.
Sports are his passion. Hoang regularly plays hockey. He is also a volunteer soccer coach to youth on the South Shore of Montreal and teaches scuba diving.
At the federal election of 2008, Hoang was the NDP candidate in the riding of Brossard-La Prairie. From 2008 to 2010, he was treasurer of the NDP Quebec Chapter and established the Commission of the cultural communities. Hoang was vice president of communications of the Québec section.
In the elections of May 2011, Hoang Mai was elected New Democrat member of the parliament in his home constituency, Brossard-La Prairie. Jack Layton gave him the role of Critic for National Revenue in his shadow cabinet and since June 2011, he is active member of the House of Commons Standing Committee on Finance.
In January 2013, NDP leader Thomas Mulcair gave him new responsabilities: he is now Deputy Critic for Justice and sits on the Justice and Human Rights committee.