Warren is a partner at the firm’s Cleveland office. As a business law attorney for more than 30 years, Warren has extensive experience in mergers and acquisitions, debt and equity financing, technology transfer and commercialization, clinical trials, financial restructuring, joint ventures and strategic alliances, licensing and distribution agreements, entity formation, shareholder disputes, and stock option and restricted stock plans.

In addition to practicing law, Warren has served as the startup CEO for three life sciences companies. From 2010 to 2015, he served as the part-time CEO of  Fluence Therapeutics Inc. in Akron, Ohio, a  Case Western Reserve University/University Hospitals spinoff company commercializing photodynamic therapy for the treatment of psoriasis and other skin diseases. He closed a convertible debt financing round; obtained Northeast Ohio grant funding; and implemented  a European commercialization strategy that included the establishment of a subsidiary in Finland, and obtaining funding from Tekes (the government of Finland). He also participated in the European Commission funded Phos-Istos project run by Inserm (the National Institutes of Health of France) and obtained funding from the European Commission.

From 2006 to 2009, Warren served as part-time CEO of CardioInsight Technologies Inc., a Case Western Reserve University/University Hospitals spinoff, in Cleveland, Ohio.  CardioInsight is commercializing electrocardiographic imaging which is used to guide ablation therapy for atrial fibrillation and other arrhythmias. (CardioInsight was sold to Medtronic in June 2015 for $93 million, plus a potential earnout.) Under his leadership the company closed a Series A venture capital financing, raised grant funding from the Global Cardiovascular Innovation Center, grew to seven employees, initiated clinical trials and in 2009 hired a full-time CEO in connection with a Series B financing.

Warren  formed Imalux Corp. in Cleveland and managed the company  from 1996 to 2001.  Imalux commercialized optical coherence tomography imaging technology developed at the Russian Academy of Sciences for catheter-based imaging of epithelial tissues. He obtained grant funding from the State of Ohio and initiated  clinical trials at the Cleveland Clinic.. In 2001, he recruited a full-time CEO, secured Series A venture capital financing and continued as a board observer representing the Institute of Applied Physics of the Russian Academy of Sciences.

At Hahn Loeser

Warren’s law practice focuses on technology companies and technology transactions, particularly in the life sciences, information technology and materials industries. He has extensive experience representing startup companies, universities and Fortune 500 companies. Warren’s experience with technology companies dates back to the early 1990s, when he represented U.S. Biochemical Corp., including the spinoff of Ribozyme Pharmaceuticals, which ultimately went public, and the sale of USB to Amersham Life Sciences.



University of Michigan Law School. J.D., cum laude, 1981


SUNY Albany, B.A., summa cum laude, economics (major) and mathematics (minor), 1978

Memberships & Affiliations

Mergers, Acquisitions and Strategic Partnerships: faculty director, (The Cambridge Institute, 1998); and Mergers and Acquisitions of Private Companies in the 90s (The Cambridge Institute, 1991, 1992, 1994).


Cleveland Bar Association Corporation and Business Law Institutes: Committee Member and/or Panel Leader, 1990, 1991 & 1992.


Case Western Reserve University, 2001 to 2005: Judge for Business Plan competition of The Institute for the Integration of Management and Engineering (TIIME); Guest lecturer at Weatherhead MBA program.


Ohio’s IT Alliance, 2000 – 2006: Board member of state of Ohio program to promote the information technology industry.


University of Akron, 2001 – 2005: Member Fitzgerald Institute for Entrepreneurial Studies Advisory Board, School of Business; Judge for Fitzgerald Institute business plan competition; Guest lecturer on business planning for startup companies for School of Business MBA program.


NEOSA Information Technology Partnerships Conference, 2001: Conceived of and organized first of a kind Northeast Ohio Software Association conference bringing together over 200 participants from industry, academia and government to review the commercial potential of selected information technologies from NASA Glenn Research Center, Case Western Reserve University, The University of Akron and Kent State University.


Regional Technology Commercialization Conference, 1998: Conceived of and organized a two-day regional conference on Advanced Technology Transfer and Commercialization at Wright Patterson Air Force Base, Dayton, Ohio. Participating institutions included Wright Patterson Air Force Base, NASA Lewis (now NASA Glenn) Research Center, Battelle Memorial Institute, The Ohio State University, the University of Michigan, the University of Cincinnati, the University of Dayton Research Institute and the Institute of Applied Physics of the Russian Academy of Sciences.


University Conflict of Interest Legislation, 1999-2000: Member of the committee that redrafted the Ohio statute regarding faculty members of state universities owning equity in university spinoffs.


Council for Economic Opportunities in Greater Cleveland, 1986-91: Board member, 1986-91; Vice president, 1990-91; Secretary, 1989-90; Operations Committee chairman, 1988-90.

Bar Admissions

State of Ohio


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

Awards & Distinctions

The Best Lawyers in America, Venture Capital Law, 2008-16


The Best Lawyers in America, Cleveland Lawyer of the Year: Venture Capital Law, 2015


The Best Lawyers in America, Corporate Law: 2014-16


Ohio Super Lawyer, 2004, 2005 & 2007 editions


AV® Preeminent Rated, Martindale-Hubbell