"[6] In 1998, with Greenspan, Henein defended former Nova Scotia premier Gerald Regan on sexual-misconduct charges.
[4][7] In her first case at her own firm, Henein defended Daniel Weiz, who was one of the young men charged in the 1999 death by beating of Toronto teen Dmitri Baranovski.
[5] Henein represented Marvin Sazant, a Toronto doctor accused of tying up several young boys and repeatedly forcing sex on them.
In 2009, the College of Physicians and Surgeons of Ontario revoked Sazant's licence "concluding that in three of the four cases, the allegations had been proved".
[7][10] In 2011, Henein's client John Magno received a twelve-year sentence in connection with an arson resulting in a death and one of the largest fires in Toronto's history "forcing the evacuation of 50 nearby homes on Danforth Avenue and requiring the services of more than 170 firefighters.
[16][17] Henein represented Mark Norman during his trial for Breach of Trust, a charge that was eventually stayed on May 9, 2019.
In 2023, Henein represented Indigenous author Dawn Walker who was accused of parental abduction, forgery, and mischief.
[18] Her brother Peter Henein, previously a lawyer with the law firm Waddell Phillips Professional Corporation,[19] is now a partner at HHR LLP.
[20] She is married to Glen Jennings, a lawyer who heads the white collar defence and investigations group at the law firm Gowlings.