MHierlMichael A. Hierl

T. 312.604.2678
F. 312.604.2679

Michael A. Hierl is a Partner of Hughes Socol Piers Resnick & Dym, Ltd. Mr. Hierl has practiced exclusively in the area of intellectual property law since 1980. He has considerable experience in a wide range of patent, trademark, unfair competition, copyright, trade secret and regulatory matters, and has successfully resolved numerous intellectual property disputes over the years, with and without litigation. He joined the firm in 2009.

Mr. Hierl has been AV® Preeminent™ rated for over 30 years by Martindale-Hubbell®, the highest rating for attorneys in terms of both legal ability and ethical standards by that company. He has also been named a Leading Lawyer in Intellectual Property law for over 14 years (since the first year of publication) by the Illinois Leading Lawyers Network.


  • The John Marshall Law School (J.D. 1980)

  • Northwestern University (M.S. 1976)

  • Southern Illinois University (B.S. 1975)



  • Illinois (1980)


  • U.S. Patent and Trademark Office

  • U.S. Court of Appeals for the Federal Circuit

  • U.S. Court of Appeals for the Seventh Circuit

  • U.S. Court for the Northern District of Illinois

  • U.S. District Court for the Northern District of Illinois – Trial Bar


  • AV® Preeminent™ Rating by Martindale-Hubbell® (1988-2019)

  • Leading Lawyer in Intellectual Property (2005-2019) by the Illinois Leading Lawyers Network, Law Bulletin Publishing Company

  • Leading Lawyer — Illinois Leading Lawyers Network



  • Member, American Bar Association

  • Member, Illinois State Bar Association

  • Member, Chicago Bar Association

  • Member, American Intellectual Property Law Association

  • Associate Member, International Trademark Association


  • Board of Directors, Chicago Area Council-Boy Scouts of America (Former)

  • Member, National Eagle Scout Association

Experienced in counseling on the proper use and protection of trademarks and service marks, preparation of trademark availability opinions, prosecution of trademark applications to registration and trademark opposition practice.

Broad experience in the preparation and prosecution of U.S. and foreign patent applications in various chemical, mechanical and electro-mechanical areas including reissue and reexamination practice.

Experienced in negotiating and preparing patent, trademark, copyright and trade secret license agreements and other technology related agreements, providing opinions on patent/trademark infringement and validity matters, counseling clients regarding infringement avoidance and advising on other intellectual property matters including management of IP portfolios.

Represented authors, publishers, songwriters, musicians, music production companies and movie studios in copyright and contract matters. Copyright litigation has involved copyright infringement, title and damages issues.

Extensive litigation experience in patent, trademark, unfair competition, copyright and trade secret matters over 30 years of practice involving many technologies and disciplines.