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    • Zachary Margulis-Ohnuma
    • Tess Cohen
    • Shane Finn
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Tess Cohen

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Tess Cohen is a criminal defense and civil rights attorney in New York City and of counsel to ZMO Law PLLC. Her practice focuses on defending complex fraud and narcotics cases, including health care fraud, mail fraud, wire fraud and narcotics conspiracies. She also handles wrongful convictions, and a variety of other criminal and civil matters in state and federal court.

Criminal Defense Attorney

Prior to joining ZMO Law PLLC, Ms. Cohen spent more than eight years as an assistant district attorney with the New York County District Attorney’s Office, where she was assigned to the Office of the Special Narcotics Prosecutor. Most recently, she served as the chief of the Prescription Drug Investigation Unit where she oversaw all the office’s work on prescription-drug related crimes, particularly investigations and prosecutions of medical practitioners selling prescriptions for controlled substances and the diversion of opioids from pharmacies and hospitals.

Ms. Cohen was lead prosecutor for numerous complex cases, including a thirteen-defendant oxycodone prescription and medicaid fraud conspiracy that involved allegations of more than $25 million worth of Medicaid fraud. She also handled the prosecution of a doctor who was charged with manslaughter due to the overdose death of two of his patients. She supervised prosecutors and analysts handling a wide array of prescription drug and health care fraud related cases. She has worked directly with a variety of state and federal law enforcement and regulatory agencies, including the NYS Office of Professional Medical Conduct, NYS Department of Education, NYS Bureau of Narcotics Enforcement, Office of Inspector General for Health + Hospitals, Office of the Medicaid Inspector General, NYC Human Resource’s Administration, the NYS Attorney General’s Office, New York State Insurance Fund, U.S. Department of Health and Human Services, as well as the DEA and NYPD.

As a result of her time as a prosecutor, Ms. Cohen has experience with investigative techniques used by law enforcement including wiretaps, confidential informants, and data analysis. She has conducted numerous hearings and trials, as well as complex motion practice and more than 100 grand jury presentations. She has worked extensively with individuals suffering from substance use disorder and their families. She is knowledgeable about drug treatment options offered throughout the state court system.

For her work, Ms. Cohen received the True American Hero Award from the Federal Drug Agents Foundation in 2019.  She has conducted numerous trainings related to investigating prescription drug crimes and health care fraud, including delivering a CLE on Prescription Drug Investigations at the New York Prosecutors’ Training Institute in July 2020.

Ms. Cohen graduated from Columbia Law School, where she was the recipient of the Lowenstein Fellowship given to a small number of graduates each year who are dedicated to working in public interest law. She also received the Jane Marks Murphy Prize for excellence in clinical advocacy. She has worked with principal attorney Zachary Margulis-Ohnuma in a variety of professional settings for more than a decade. As a law student intern in 2010, she uncovered crucial evidence that helped lead to the exoneration of Antonio Yarbough four years later.

She is also active in criminal justice policy work at the New York City Bar Association. She is the chair of the City Bar’s Criminal Justice Operations Committee and a member of the Mass Incarceration Task Force. She was a fellow in the 2018 Women in Power program at the 92nd Street Y. Ms. Cohen’s experience as a prosecutor combined with her demonstrated devotion to the rights of those accused of crimes and sensitivity to the injustices in our criminal justice system make her an ideal complement to our team of client-focused, trial-ready criminal defense lawyers.

ZMO Law PLLC Attorneys
  • Zachary Margulis-Ohnuma
  • Tess Cohen
  • Shane Finn
Contact ZMO Law
Latest Blogs By Tess Cohen
  • Governor Hochul vetoed bills aimed to curb police misconduct and overturn wrongful convictions
  • New Yorkers Get a Second Chance with the Clean Slate Act
  • The Power of a Defense Expert

ZMO Law In the News

June 18, 2025
The Nation: ZMO client Shujun Wang is a “bad example” of Chinese transnational repression
In a fascinating critical analysis of the Shujun Wang trial and the media coverage of it, the storied liberal newsweekly The Nation took on 60 Minutes, the FBI, and the federal prosecutors who pursued ZMO client Shujun Wang for the better part of a decade. “Prosecutors likened Wang’s work to that of a John LeCarré ...
May 30, 2025
Buffalo News: Prosecutors in retrial of 1993 homicide want to keep motions secret
Any ruling that blocks the release of the defense motions would “impose a prior restraint on Mr. Pugh and this office’s right to free speech and free expression,” defense attorney Zachary Margulis-Ohnuma wrote in a letter to the judge. Margulis-Ohnuma also said he saw no basis for keeping sealed the people’s request to block the ...
May 21, 2025
ZMO explains to 60 Minutes why his client was spared prison time in Chinese spying case
China’s spies are everywhere, according to a the season finale of 60 Minutes that aired last Friday. But ZMO Law PLLC client Shujun Wang, a 74-year-old Chinese-born American historian based in Queens, was not sent to prison even after he was convicted of violating the Foreign Agent Registration Act. Attorney Zachary Margulis-Ohnuma explained the weaknesses ...
May 6, 2025
Margulis-Ohnuma questions case against Sean Combs
According to Reuters, Diddy’s lawyers face an uphill battle to undermine his accusers. But the case charges both sex trafficking and racketeering–known as RICO. “The fact that he had a fight with his girlfriend seems like a thin reed to charge RICO,” Margulis-Ohnuma said, referring to the Racketeer Influenced and Corrupt Organizations Act.
April 28, 2025
ZMO on Diddy trial: Both sides want a jury without strong opinions
Zachary Margulis-Ohnuma, a New York-based defense lawyer, said Combs’s panel would likely consist ultimately of people without firm convictions about issues of consent and sexual abuse. “One side or the other will figure out a way to get rid of the ones who do have strong opinions,” Margulis-Ohnuma said.

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We serve the following localities: New York City including New York County, Bronx County, Kings County, and Queens County; and Westchester County.

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353 Lexington Avenue, Suite 900
New York, NY 10016
Phone: (212) 685-0999

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