About Cassandra da Costa

Employers facing a union negotiation, a grievance, a human rights complaint or a wrongful dismissal claim can turn to Cassandra da Costa, a senior associate in the London office of Filion Wakely Thorup Angeletti. Cassandra's clients include public and private sector organizations of every size, and the aim is to bring a collaborative, creative approach to the knotty workplace problems they bring in.

Cassandra's U.S. work meant acting for a large American city on its labour and employment files: bargaining with its unions, working through workplace disputes and handling human rights matters. That all came before the Ontario call. Admission to the Washington bar came in 2014, Missouri followed in 2016 and Ontario in 2019. Ahead of joining Filion as an associate in January 2020, Cassandra worked at a London firm devoted to management-side labour and employment law.

That city work left Cassandra with a real feel for the politics, culture and socio-economic pressures local governments deal with. It's also why the workplace issues that come up with police services and utilities, and with the unions representing public sector staff, are familiar ground. And because Cassandra has practised in more than one jurisdiction, U.S. employers trying to find their way through Canada's workplace rules get someone who knows both sides of that line.

Cassandra writes and presents often for employers and HR teams, covering topics from federal termination requirements and pay equity deadlines to human rights damages and managing addiction issues at work.

Practice areas

Labour relations and arbitration

Cassandra handles collective bargaining, labour disputes and grievance arbitrations for employers, and co-wrote a 2023 LexisNexis practice note on getting ready for interest arbitration.

Human rights and dismissal defence

On the litigation side, Cassandra defends employers against wrongful dismissal claims and deals with human rights and employment standards matters.

Contracts and workplace policies

Cassandra drafts and advises on employment contracts and the policies that govern a workplace.

Municipalities and the public sector

Cassandra understands how municipalities work, including the labour and employment issues facing police services and utilities and the unions that represent public sector staff.

Education & credentials

  • Juris Doctor, Boston College Law School (2013)
  • Bachelor of Arts, Boston College (2008)
  • Call to the Bar of Ontario (2019)
  • Admission to the Bar of Missouri (2016)
  • Admission to the Bar of Washington (2014)

Publications & speaking

Memberships & affiliations

  • Ontario Bar Association: Cassandra da Costa is a member of the Ontario Bar Association.
  • Canadian Bar Association: Cassandra da Costa belongs to the Canadian Bar Association.
  • Middlesex Law Association: Cassandra da Costa is a member of the Middlesex Law Association.

Is this you?

Fix or remove this listing, or add a free listing badge

Something wrong with this listing? Tell us and we’ll hide it right away while we review your request, then correct it or take it down.

Add your free listing badge

Add the free LawOnline listing badge to your website. It tells visitors you’re listed in an independent Canadian lawyer directory and links back to this profile. Being listed isn’t a certification or an endorsement, and the badge doesn’t mean we’ve checked your credentials.

LawOnline.ca Canadian Lawyer Directory listing badge

This listing was generated by AI from public sources in October 2026. It may contain errors, and we can’t guarantee it’s accurate or complete. Before you rely on anything here, verify it on their firm’s website. Confirm Cassandra da Costa’s licence and standing in the Law Society of Ontario directory ↗

How this data is compiled and checked · Correct or remove this listing