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Colleen M. O’Neil Partner

Colleen is a litigator in the Business, Corporate and Commercial Litigation group.

Colleen has extensive representative experience in federal and state courts on behalf of clients resolving disputes concerning: 

  • Commercial contract disputes
  • Title VII claims
  • Real property disputes
  • Federal civil rights litigation
  • Employment and trade secret claims
  • Estate and probate matters

Colleen has counseled and represented clients on employment and labor issues.  She has successfully prosecuted and defended a variety of business tort claims in both federal and state courts.  Colleen has represented clients in the energy industry in various types of litigation, including contractual disputes, real estate disputes and employment matters.  She also has extensive appellate experience appearing before the United States Courts of Appeals for the First, Fifth and Sixth Circuits, the United States Supreme Court and the Eighth District Court of Appeals of Ohio.

Colleen is a member of the Ohio and Cleveland Metropolitan Bar Associations and an active member of the American Bar Association’s Litigation Section.  She is a member of the firm’s Associate and Diversity Committees and is heavily involved in the community.  Colleen is privileged to serve on the Board of Directors of Magnificat High School, the Advisory Board to Metro Catholic School and is a founding member of Cleveland’s Irish American Law Society.  She was recently selected for the 2016 Leadership Cleveland Class.

She joined Calfee in 1998.