Joel S. Sonnenberg

200 Public Square
Suite 2800
Cleveland, Ohio 44114

Primary Practices

Joel S. Sonnenberg applies his knowledge as a trained engineer to counsel clients on a wide range of intellectual property issues. Joel has extensive experience researching patent, trademark, trade secret and copyright matters. Joel prepares memoranda regarding litigation and intellectual-property issues, patent applications and responses to office actions from the United States Patent & Trademark Office and abroad.

Joel’s experience strikes an intriguing balance between law and technical fields. Prior to joining Hahn Loeser, Joel was a project engineer and a project manager for one of Engineering News-Record’s Top 400 Contractors and one of Modern Healthcare Magazine’s Top Healthcare Contractors. During this time, Joel gained experience working with designers, engineers and contractors on the smallest details of complex building components, including mechanical, electrical, civil and structural systems. He is familiar with green design practices as he has been LEED® AP credentialed since 2008. Prior to managing projects, Joel acquired hands-on experience working as a skilled laborer, carpenter and mechanic. He brings this broad-based skill set to his law practice, providing clients with approachable and uniquely qualified legal counsel.



Cleveland-Marshall College of Law, cum laude, J.D., 2013

Honors & Activities: Business Law Concentration; The Global Business Law Review (GBLR), Executive Symposium Editor, 2012-13, Associate, 2011-12


University of Toledo, B.S., Civil Engineering, Minor in Business Administration, 2002

Community Involvement

Ohio Farm Bureau, Medina County Active Member


2017 Medina County Local Government Leadership Academy

Awards & Distinctions

Ones to Watch, Best Lawyers®, Patent Law, 2021-22


LEED® AP, Green Building Certification Institute, 2008-present


Rising Star, Ohio Super Lawyers®, 2018, 22

Bar Admissions

State of Ohio, 2013


U.S. Court of Appeals for the Federal Circuit, 2016


U.S. District Court for the Northern District of Ohio, 2016


Registered Patent Agent/Attorney, U.S. Patent and Trademark Office, 2012-present

Memberships & Affiliations

Ohio State Bar Association (OSBA), Member


American Bar Association (ABA), Member


Cleveland Intellectual Property Law Association (CIPLA), Member


American Agricultural Law Association (AALA), 2017 Planning Committee, Member