Areas of Practice
  • Georgetown University Law Center, J.D., cum laude, 1980, Editor, Georgetown University Law Review
  • Cornell University, B.A., 1975
Judicial Clerkships
  • Hon. James L. Latchum, US District Court, District of Delaware, 1980-1982
Bar & Court Admissions
  • District of Columbia
  • US Supreme Court
  • US District Courts for the District of Columbia and the District of Maryland
  • US Courts of Appeals: District of Columbia, Second, Third, Fourth, Sixth, and Ninth Circuits

Antonia B. Ianniello

1330 Connecticut Avenue, NW
Washington DC 20036
TEL: +1 202 429 8087
FAX: +1 202 429 3902

Toni Ianniello is a partner in Steptoe's Washington office and the head of the Commercial Litigation and Arbitration Department.  She is also a member of the firm's Executive and Management Committees.  For more than 15 years, she served as chair of Steptoe’s Insurance and Reinsurance Group.  She is recognized as one of the leading insurance coverage lawyers nationally and has been ranked in numerous industry guides, including Chambers, Washingtonian magazine’s "Top Lawyers," Best Lawyers, Super Lawyers, and Legal 500, which described her as a "first-rate lawyer" who has "produced outstanding results in the most difficult cases."

For more than 30 years, Ms. Ianniello has handled a wide array of complex litigation matters, serving as lead counsel in numerous insurance coverage disputes relating to CGL, property, errors and omissions, and D&O policies, as well as surety and fidelity bonds, and other specialty insurance products.  She has represented insurers in numerous high-profile coverage matters involving major pharmaceutical products liability claims, mass tort claims, first-party property matters, and asbestos liability, construction defects, and bad-faith claims.  She recently served as international coordinating counsel for a major insurer on all claims arising out of the Japan earthquake/tsunami disaster.  She has appeared in courts throughout the United States and also served as lead counsel in major insurance and reinsurance coverage arbitrations, both in the United States and overseas.  Ms. Ianniello has successfully resolved hundreds of matters, large and small, through mediation or other alternative dispute resolution procedures.

Ms. Ianniello also regularly defends attorneys and directors and officers in suits alleging negligence, breach of fiduciary duty, conflicts of interest, securities fraud, and RICO.  She has represented attorneys and law firms in disciplinary matters before Bar Counsel and the courts.  She formerly served as an elected member of the Board of Governors of the District of Columbia Bar, and as General Counsel to the DC Bar.  She was recently appointed by the President of the ABA to the Standing Committee on Lawyers Professional Liability and is a frequent speaker on professional liability, insurance and other issues.

Ms. Ianniello has represented companies and individuals in other complex commercial disputes, including litigation involving contract disputes, fraud claims, RICO allegations, accounting negligence, shareholders suits, brokerage suits and negligence claims.  She also has represented both individuals and corporations in major grand jury investigations involving allegations of government procurement fraud, securities, tax and bank fraud, criminal food and drug violations, and public corruption.  She served as an Associate Counsel in the Office of Independent Counsel Lawrence Walsh (Iran-Contra) during 1989-90.


  • Euromoney's Expert Guide to Women in Business Law 2012-2013, Insurance &  Reinsurance
  • Business Insurance’s Women to Watch award, 2011
  • Legal 500 US, Insurance: Advice to Insurers, 2011-2017
  • Legal 500 US, Litigation: Insurance, 2010
  • Chambers USA, Insurance: Insurer (District of Columbia), 2009-2017
  • Washingtonian magazine, "Top Lawyer," Insurance, 2011
  • Washington, DC Super Lawyers, Insurance, 2009-2017
  • Washington, DC Super Lawyers - "Top 50 Women," 2012
  • Best Lawyers in America, Legal Malpractice Law and Insurance Law, 2003-2018
  • BTI Client Service All Star Team 2008
  • Euromoney's Expert Guide to the World's Leading Insurance and Reinsurance Lawyers, 2006-2013

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Professional Affiliations

  • Standing Committee on Lawyers' Professional Liability, American Bar Association
  • Litigation Section, American Bar Association
  • Tort and Insurance Practice Section, American Bar Association
  • Fellow, American Bar Association
  • Insurance Editorial Advisory Board, Law360, 2011