Susan is a partner in Ursel and Wilkey, a law firm specializing in human rights and labour law. She has litigated cases promoting the rights of lesbians and gays, and has been active in political lobbying to obtain equity under the law. Susan was co-counsel on MCCT's intervention in Egan and counsel to Mary-Woo Sims in the Sims and Dwyer human rights decision.
Susan chaired the lobbying committee of the Campaign for Equal Families and wrote much of the public education materials used by the Campaign. Following the defeat of Bill 167, Susan turned her efforts towards establishing a legal and public education fund to advance the rights of same sex spouses and their families.
The activities of Susan and others in what was called the "Saturday Morning Workgroup", has led to the formation of the Foundation For Equal Families. Susan serves the board as a member of the Legal Action Committee.
She was also among the founding members of the Feminist Legal Analysis Committee and the Gay and Lesbian Issues and Rights Committee of the Canadian Bar Association: Ontario, now the Ontario Bar Association. She participated as a member of the Advisory Committee to the Toronto Board of Education's Triangle Program.