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The Professional Conduct Committee of CPA Ontario hereby makes the following Allegations of professional misconduct against John M. Rosenthal, CPA, CA, a member of CPA Ontario:
Feb 14, 2026 · Rosenthal, 75, is alleged in a court action to have masterminded a Ponzi scheme — using later investors to pay off earlier investors. It's a cautionary tale for people who invest money without asking e...
Feb 14, 2026 · The case of JohnRosenthal, a Toronto accountant once trusted by a network of affluent clients, has unravelled further, revealing a complex web of alleged deceit and financial hardship.
Feb 14, 2026 · As real estate scheme unravelled, Rosenthal made excuses for bounced cheques: he was sick, he’d been hit by a “major wire fraud.” Second of two parts.
Feb 13, 2026 · In a shocking turn of events, Toronto accountant JohnRosenthal faces serious allegations of orchestrating a Ponzi scheme, reportedly defaulting on millions owed to his clients.
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Nov 21, 2022 · View JohnRosenthal's business profile as --None-- at Rosenthal Zaretsky Niman. Find contact's direct phone number, email address, work history, and more.
The Professional Conduct Committee of CPA Ontario hereby makes the following Allegations of professional misconduct against John M. Rosenthal, CPA, CA, a member of CPA Ontario:
Rosenthal Zaretsky Niman & Co is a firm of Chartered Professional Accountants based in Toronto, Ontario, led by John M. Rosenthal, CPA CA. The company is noted for providing expert accounting services and analysis, en...
Feb 13, 2026 · JohnRosenthal, whose tax advice was always highly sought after, faces millions in claims in 15 court actions. He says he’s broke. First of two parts.
