Person Photo
Person Photo

Michael O'Leary

Of Counsel

901 K Street NW, Suite 850, Washington, DC 20001

Mike O’Leary represents companies and individuals in connection with investigations and enforcement actions by domestic and foreign regulatory and criminal authorities.

Mike regularly counsels businesses facing compliance and regulatory issues relating to foreign bribery, money laundering, the Arms Export Control Act (AECA), the International Traffic in Arms Regulations (ITAR), the Foreign Agents Registration Act, and U.S. economic sanctions programs administered by the U.S. Department of the Treasury's Office of Foreign Assets Control (OFAC).

Mike previously served as an Assistant United States Attorney in the U.S. Attorney's Office for the Southern District of Florida in Miami, where he investigated and prosecuted a wide variety of federal offenses, including bank and wire fraud, identity theft, violent crimes, Medicare fraud, money laundering, currency-related offenses, and international narcotics trafficking. During his time as a federal prosecutor, Mike tried sixteen jury trials and argued two cases before the Eleventh Circuit Court of Appeals. Mike also previously served as a law clerk to the Honorable Cecilia M. Altonaga, United States District Judge for the Southern District of Florida.

Client Results

Representative Matters
  • Represented a major defense contractor in connection with an internal investigation relating to alleged ITAR violations, a large audit of its export compliance protocols, and voluntary disclosures to the U.S. Government.

  • Counsels a Fortune 100 heavy equipment manufacturer on US. export controls and economic sanctions compliance matters.

  • Obtained final judgment on behalf of a group of U.S. service members and their families against Iran after a bench trial in federal court.

  • Represents U.S. Government employees killed and injured in August 1998 bombings of the U.S. Embassies in Nairobi, Kenya and Dar es Salaam, Tanzania in a number of civil actions against entities and governments who supported the attacks.

  • Represented an individual in connection with criminal federal bribery charges.

  • Counsels multiple entities and individuals regarding registration obligations under the FARA.

  • Advises a number of companies on anti-money laundering and anti-corruption compliances issues.

  • Represents an entity in connection with federal litigation arising from relief fund awards under the federal CARES Act.

  • Represented a major financial institution in connection with a wide variety of domestic and foreign inquiries into alleged manipulation of benchmark interest and exchange rates.
  • Represented a number of Swiss financial institutions and a Swiss professional services firm in connection with investigations related to the DOJ’s Offshore Tax Compliance Initiative.
  • Represented a foreign bank in an internal investigation into possible violations of OFAC sanctions.
  • Represented a foreign executive in connection with an investigation into alleged economic espionage.
  • Represented a large international electronics company in a multimillion-dollar civil fraud case.



Speaking Engagements


Bar Admissions

Court Admissions


Unless you are a current client of Holland & Hart LLP, please do not send any confidential information by email. If you are not a current client and send an email to an individual at Holland & Hart LLP, you acknowledge that we have no obligation to maintain the confidentiality of any information you submit to us, unless we have already agreed to represent you or we later agree to do so. Thus, we may represent a party adverse to you, even if the information you submit to us could be used against you in a matter, and even if you submitted it in a good faith effort to retain us.