Jennah was a summer and articling student at the firm, where she began to develop her practice in commercial litigation, professional liability, bankruptcy law, and administrative and public law.

Prior to rejoining the firm, Jennah served as a judicial law clerk to the Honourable David W. Stratas at the Federal Court of Appeal and the Honourable Malcolm Rowe at the Supreme Court of Canada.

Jennah completed her JD at Osgoode Hall Law School, where she mooted competitively, received a number of course prizes, and was Managing Editor of the Osgoode Hall Law Journal.

Before law school, Jennah spent four years at the United Nations in Vienna on a diplomatic team working towards a major Middle Eastern arms control agreement.