Shantona represents both individual and institutional clients in civil and commercial litigation and has particular expertise in appeals. Her experience includes commercial disputes, class actions, torts, judicial review, professional discipline, professional negligence, administrative, constitutional, public international law, and national security law. Shantona has been counsel in over 40 appeals at the Ontario Court of Appeal, the Divisional Court, the Federal Court of Appeal, and the Supreme Court of Canada. She also represents clients before the Superior Court of Justice and administrative tribunals.

Shantona was selected as Best Lawyer’s 2022 “Lawyer of the Year” in Appellate Practice. In 2021, she was named a Fellow of the Litigation Counsel of America. Also in 2021, She is ranked in the Chambers Guide to Canada’s Leading Lawyers, the Lexpert Directory, Best Lawyers, and Benchmark Litigation. She is on Benchmark’s list of the “Top 50 Women in Litigation”.  She was selected as a Lexpert ‘Rising Star’ in 2017, and included on Benchmark’s “Under 40 Hot List” in 2018 and 2019.

The Chambers Guide to Canada’s Leading Lawyers notes that Shantona has been described as: "A superlative advocate" (2022); “One of the best young civil appellate advocates in Canada.” (2021); “A brilliant legal analyst” (2020); "Her performance earns her respect, as sources note that ‘the judges rave about her’” (2019); “An ‘outstanding’ litigator and a ‘force to be reckoned with’” (2018); “One of the smartest lawyers out there right now"; "A brilliant advocate” (2017).

Shantona is the co-Executive Director of the Supreme Court Advocacy Institute, a national non-profit organization offering advocacy training to counsel appearing before the Supreme Court of Canada. She is a former law clerk to Justice Ian Binnie of the Supreme Court of Canada. Shantona is fluently bilingual (English/French) and was called to the Bar in both Ontario and Québec in 2007. She obtained her B.C.L. from Oxford; her B.C.L./LL.B. from McGill; and her M.A. & B.A. from Queen’s University. 

Prior to starting practice, she clerked for Justice Ian Binnie, trained as a Middle Temple Fox Scholar pupil barrister in London, interned at the UN International Criminal Tribunal for Rwanda, interned at the Parliament of Canada, and worked in the music industry.