R. Mark Halligan is an accomplished trial lawyer who focuses his practice on intellectual property litigation and complex commercial litigation in federal and state courts throughout the United States.

An experienced patent litigator, Mark has also developed an extensive practice as an intellectual property litigator focused on protection and enforcement of trade secrets.

Mark has successfully represented both individuals and corporations as plaintiffs and defendants in federal and state courts in the United States.

A leader in his field, Mark was recently named in Legal 500 United States as a leading lawyer in trade secrets litigation. He has been recognized for the third consecutive year for exceptional standing in the legal community in Chambers USA: America's Leading Lawyers for Business 2011 for intellectual property. Additionally, Intellectual Asset Management (IAM) Magazine named Mark to its IAM 250 – A Guide to the World's Leading IP Strategists for three consecutive years. He has also been named a "Super Lawyer" by the Illinois Super Lawyers magazine since 2005.

Mark is a frequent lecturer on intellectual property issues and he serves on the Adjunct Faculty of John Marshall Law School in Chicago where he teaches trade secrets law. Mark also serves on the AIPLA AMICUS committee as well as the Executive Committee of the United States Group of the International Association for the Protection of Intellectual Property (AIPPI). He was the Co-Chair of the Q215 Committee on Trade Secrets at the recent AIPPI World Congress in Paris.

Mark is the Counsel of Record for Amici Curiae Association Internationale Pour La Protection De La Propriete Intellectuelle (AIPPI) and International Association for the Protection of Intellectual Property (AIPPI-US), Bilski v. Doll, Supreme Court of the United States, Case No. 08-964 (August, 2009).

Mark is admitted to practice in Ohio and Illinois. He is also admitted to practice before the following courts: the United States Supreme Court; the United States Courts of Appeals for the Federal, DC, Sixth and Seventh circuits; and federal district courts including the Northern and Southern districts of Ohio, the Northern District of California, the Eastern District of Wisconsin, and the Northern District of Illinois, including the Trial Bar.