A seasoned trial lawyer and former federal prosecutor, Tinos Diamantatos serves as the deputy chair of the firm’s global government investigations and white collar practice. Noted by Chambers USA as “an outstanding trial lawyer” who is “tremendous for clients and a good counselor,” Tinos represents organizations and individuals in trial work, litigation, government and internal investigations, and securities enforcement proceedings. This includes white collar crime, litigation related to government investigations, qui tam litigation, and complex civil litigation. In addition, he counsels clients on regulatory compliance issues. Tinos is a Fellow of the American College of Trial Lawyers. He also serves as deputy managing partner of the firm's Chicago office.
Listed as one of Crain’s Chicago Business “Notable Litigators and Trial Attorneys” for 2023, Tinos has tried more than 20 cases and achieved an outstanding record of success at trial. Tinos’ trial representations span jurisdictions in both federal and state courts throughout the United States and have involved complex civil and criminal matters. Included among his trial successes are two separate trial wins for a Fortune 10 company.
Tinos’ representations span several industry sectors, including the retail, pharmaceutical, healthcare, pharmacy, medical device, and financial services industries. He has handled investigations, the defense, and prosecutions of matters involving alleged healthcare fraud, commodities fraud, mortgage fraud, money laundering, bank fraud, wire fraud, mail fraud, and tax evasion. Tinos has also handled other complex matters involving terrorism, racketeering, extortion, corruption, obstruction, and civil rights violations.
Tinos serves as the deputy chair of the firm’s global white collar government investigations and sanctions practice. Tinos has been trusted by Fortune 500 companies, industry-leading pharmaceutical companies, healthcare companies, retail pharmacy chains, financial institutions, privately held businesses, and individuals in matters of utmost importance. Alongside members of the firm’s elite white collar team, Tinos helps clients navigate government investigations, regulatory minefields, and related white collar litigation throughout the United States and around the world.
Prior to joining Morgan Lewis, Tinos was a federal prosecutor at the US Attorney’s Office in Chicago where he successfully handled high-profile cases and trials that received national and international media attention. He also successfully served as lead appellate counsel representing the government on nine appeals before the US Court of Appeals for the Second Circuit and the US Court of Appeals for the Seventh Circuit. Tinos served in a number of sections within the Chicago US Attorney’s Office, including the Financial Crimes and Special Prosecutions Section, and the office’s Public Corruption and Organized Crime Section, where he completed his career as a prosecutor.
Tinos is a Fellow of the American College of Trial Lawyers, one of the premier, invitation-only legal associations in North America. He is also a former president of the prestigious Chicago Inn of Court, maintains an active pro bono practice, and is involved in multiple mentoring initiatives. Tinos is a former member of the John Marshall Law School Board of Trustees and has served as an adjunct trial advocacy professor for the law school, where he has also coached many successful trial teams competing at the national level. He also teaches, by invitation, law enforcement courses on trial techniques and investigative tactics to federal agents at their national training centers.
False Claims Act/Qui Tam Litigation
Criminal Investigations
Securities Fraud
Internal Investigations
Commercial Litigation
Fellow, American College of Trial Lawyers
Recognized, Notable Litigators and Trial Attorneys, Crain’s Chicago Business (2023)
Listed, The Best Lawyers in America, Criminal Defense: White-Collar, Chicago (2023–2025)
Ranked, Litigation: White-Collar Crime & Government Investigations, Illinois, Chambers USA (2021–2024)
Up and Coming, Litigation: White-Collar Crime & Government Investigations, Illinois, Chambers USA (2020)
Recommended, Dispute resolution: Corporate investigations and white-collar criminal defense, The Legal 500 US (2016, 2018–2024)
Named, Modern Healthcare’s “Largest Healthcare Firm” (2016–2021)
Recognized by Chicago Lawyer and Chicago Daily Law Bulletin as one of the Top 40 Under Forty lawyers in Illinois (2017)
Named, 2016 Emerging Lawyers’ Top Ten List (2016)
Recipient, Chicago Crime Commission's Mitch Mars Prosecutorial Excellence Award (November 2011)
Recipient, Chicago Crime Commission's Star of Distinction Criminal Justice Award (November 2010)
President, Chicago Inn of Court (2017–2018)
Member, Chicago Bar Association
Member, Federal Bar Association
Member, Seventh Circuit Bar Association
Member, American Bar Association
Member, Hellenic Bar Association
Member, The John Marshall Law School Board of Trustees
Member, Order of John Marshall