Tel: (416) 847-2560 x242 |

Gabriel Gross-Stein graduated from the University of King’s College with an honours degree in Classics in 2008. He completed his Juris Doctor at Osgoode Hall Law School in 2012 and was called to the Bar of Ontario in 2013.

At Osgoode Hall, Gabriel developed an intense focus on criminal law. He was a member of the Innocence Project, which seeks to exonerate those who have been wrongfully convicted. He also wrote about and researched constitutional and criminal issues for various professors as a research assistant. As a member of the 2011 Wilson Cup Moot team, he won an award for best overall factum.

After graduating, Gabriel articled with Lockyer Campbell Posner and joined the firm as an associate. While articling, he assisted on both trials and appeals with all of the senior partners of the firm at every level of court, including the Supreme Court.

Having been mentored by senior counsel at Lockyer Campbell Posner, Gabriel, as an associate, seeks to uphold Lockyer Campbell Posner’s reputation for excellence. He continues to assist the senior partners of the firm on serious criminal cases and carries his own files. He has a strong record of success in court and regularly secures acquittals on behalf of his clients.


Gabriel has a strong record of success when contesting matters in court and is fiercely dedicated to achieving the best results. He has successfully defended clients charged with both Criminal Code and Controlled Drugs and Substances Act offences. He also regularly obtains withdrawals for his clients. Gabriel regularly appears at all levels of Court in Ontario, from the Ontario Court of Justice to the Ontario Court of Appeal. He secures excellent results for his clients.


J.D., Osgoode Hall Law School, 2012
B.A., Honours in Classics, University of King’s College, 2008

Call To The Bar

Ontario 2013

Professional Memberships

Criminal Lawyers Association
Toronto Lawyers Association

  •  Notable Cases
    • R. v. D.D. – Mr. Gross-Stein secured an acquittal of a minor on charges of possession of a firearm after extensive cross-examination of the Crown’s firearms expert from the Centre of Forensic Sciences. The trial judge found that the expert’s conclusions were not sufficiently reliable and acquitted the accused.

      R. v. Cain – Following a lengthy Superior Court trial Mr. Gross-Stein’s client was acquitted of robbery with a firearm. A lengthy and effective cross-examination of the complainant resulted in a finding that she was not a credible witness.

      R. v. M.D. – Mr. Gross-Stein’s client was acquitted of sexual assault and sexual interference after a Superior Court trial. After cross-examination, the complainant’s evidence was found to be insufficiently reliable.

      R. v. Purewal – Mr. Posner and Mr. Gross-Stein successfully appealed the accused’s conviction for impaired driving. After the successful appeal, the charges against the accused were withdrawn.

      R. v. Papasotiriou – Mr. Lockyer, assisted by Mr. Gross-Stein, successfully argued that the accused should not be committed to stand trial for first degree murder. The Toronto Star reported on that case here: