Marc J. Kessler
Marc J. Kessler

65 East State Street
Suite 2500
Columbus, Ohio 43215

Primary Practices

Marc J. Kessler is an experienced trial lawyer who is widely regarded as one of the nation’s preeminent business litigators. He has extensive experience with large scale, “bet-the-company” matters and is widely recognized for his ability to handle the most complex and critical litigation issues. Marc’s expertise includes complex commercial transactions, procurement, healthcare, trade secrets and non-competition, product liability, business torts, real estate, intellectual property rights, and toxic tort defense.

During his almost 30 years of practice, Marc has tried, litigated, arbitrated, mediated or otherwise resolved a wide variety of disputes and other client matters across the country. Marc’s clients include large publicly traded corporations, healthcare companies, chemical companies, steel manufacturers, financial institutions, accounting firms and a variety of governmental entities.

As part of his sophisticated practice, Marc counsels healthcare clients as they navigate the complex regulatory environment and assists clients in resolving disputes with state government entities through administrative litigation. Marc has significant experience representing clients in administrative hearings through contested case hearings and defending favorable decisions through appeals. His representation includes serving as national counsel to one of the largest health insurance providers in the country for more than 12 years. In this representation, Marc has built a reputation based on providing top-notch innovation, quality and service in all aspects of state and local government procurement, including leading the firm’s representation of this client in numerous matters where billions of dollars are at stake.

In addition to his representation of clients in the healthcare industry, Marc represents a large range of clients in non-compete, non-solicitation, and trade secret matters, helping them protect their competitive advantage.

Marc has also achieved significant trial success for his clients in complex, high-stakes product liability litigation.

In addition to his thriving litigation practice, Marc is a member of Hahn Loeser’s Board of Directors and is the former CEO and Managing Partner of the firm. He leads the firm’s Litigation Practice Area in Columbus and mentors other attorneys across the firm’s six offices.

As part of his national recognition, Marc has been listed in Best Lawyers in America® every year since 2005 and was recently recognized by Best Lawyers as a “Lawyer of the Year” in Columbus for 2022. He is also recognized by Chambers USA as one of the top litigation attorneys in Ohio. He is further consistently recognized as an Ohio Super Lawyer.

Outside of his practice and contributions as a leader at Hahn Loeser, Marc is active in community organizations supporting Central Ohio.

Professional History

  • Partner, Hahn Loeser & Parks LLP, 2002-present; Chief Executive Officer and Managing Partner, 2017-19; Partner-in-Charge, Columbus, Ohio office, 2011-17
  • Vice Chair, Ohio Supreme Court Commission on Certification of Attorneys as Specialists



Capital University Law School, J.D., 1992

Honors & Activities: Dean’s Fellowship Award

Dickinson College, B.A., cum laude, 1989

Community Involvement

Central Ohio Diabetes Association (CODA), Board of Directors


United Way, Member, Young Leaders


Children’s Hospital Development Board, Executive Board

Awards & Distinctions

Chambers USA, Commercial Litigation, 2013-22


Ohio Super Lawyers®, Business Litigation, 2004-23; Top 100 Ohio, 2011; Top 50 Columbus, 2011, 2021


The Best Lawyers in America®, Franchise Law, 2012-23; Commercial Litigation, 2016-23; Mass Tort Litigation /Class Actions – Defendants, 2016-23; Product Liability Litigation-Defendants, 2019-23; Columbus Lawyer of the Year,  Mass Tort Litigation/Class Actions – Defendants, 2018; Columbus Lawyer of the Year, Franchise Law, 2022


“Top Lawyers,” Columbus CEO, 2010 – 2021


AV Preeminent®, Martindale-Hubbell

Bar Admissions

State of Ohio, 1992


U.S. District Courts for the Southern and Northern Districts of Ohio, 1993; U.S. Court of Appeals for the Sixth Circuit, 1993; U.S. District Court of Appeals for the Ninth Circuit, 2007; U.S. Bankruptcy Court for the Southern District of Ohio, 1993

Memberships & Affiliations

American Bar Association, Member; Forum on the Entertainment and Sports Industries; Young Lawyers Division, Arts, Entertainment and Sports Law Committees, Vice Chair


Ohio State Bar Association, Member; Sports and Entertainment Law Committee, Chairman; Litigation Committee


Columbus Bar Association, Member; Construction Law Committee; Sports and Entertainment Law Committee


Capital University School of Law: Adjunct Professor, Professional Sports Law