
Tannis was called to the bar in 2003 and practices in the areas of real estate, corporate/commercial, and estate planning. In 2018, she was certified as a specialist in real estate by the Law Society of Ontario.
As a former Trustee for the Toronto Lawyers Association, Tannis has been involved in advocacy and education initiatives, most notably the moderator and presenter of continuing education programmes and writer of articles for the TLA journal. She currently sits on the education committee which is responsible for producing CPD programmes for Toronto lawyers.
She is also a member of the Condominium Sub-documents Committee of the Working Group on Lawyers and Real Estate which is responsible for producing province-wide precedent materials for condominium transactions.
Tannis is a frequent presenter for continuing legal education programmes and, in the past, has spoken on the issue of real estate, estates and ethics for the Canadian Bar Association,/Ontario Bar Association, Law Society of Upper Canada, The Commons Institute and the Toronto Lawyers Association.