My Why
What powers my practice
I was considering becoming a doctor, but a conversation with my mother in seventh grade—where she reminded me that doctors protect health while lawyers protect freedom—inspired me to pursue law instead. I find the greatest satisfaction in winning trials and helping clients solve complex problems, and I am energized by the teamwork it takes to prepare and execute a successful strategy. In my work, I focus on fostering collaboration by leveraging the strengths of both clients and colleagues, always aiming to solve my clients’ problems thoughtfully and efficiently.
Overview
Marshall’s practice focuses on resolving disputes regarding scientific issues and counseling clients in chemical and biotechnology matters. A skilled first chair litigator and trial lawyer, his practice includes helping clients develop strategies for obtaining and effectively enforcing their intellectual property rights.
Clients seek Marshall's advice to help solve complex intellectual property-related problems. His strong grasp of IP, together with effective use of internal investigations, enable him to understand how a dispute will impact the client’s business interest. His experience spans a wide spectrum of matters, including:
- Patents, including prosecuting and defending American Invents Act trials before the U.S. Patent Trial and Appeal Board (PTAB)
- Trade secrets and unfair competition
- Trademarks
- Copyright
- Antitrust
- Contract disputes, including federal terminations for default and False Claims Act
- Insurance coverage
Experience
Solutions in action
Marshall’s trial experience spans a wide range of civil and criminal matters, including the following:
- Trials before the Circuit Court of Cook County, Illinois, the U.S. District Courts for the Northern District of Illinois, the Southern District of New York, the Eastern District of Missouri, the Eastern and Western Districts of Michigan, the Western District of Wisconsin, the Middle District of North Carolina, and the U.S. Court of Federal Claims
- Litigation before U.S. District Courts, including the Eastern and Western Districts of Michigan and the Northern District of California, and in the California Superior Courts (Los Angeles and San Diego)
- Appeals before the U.S. Court of Appeals for the Seventh Circuit, the California Court of Appeals, the Wisconsin Court of Appeals, the Illinois Appellate Court, the United States Courts of Appeals for the Ninth and Federal Circuits, and the U.S. Supreme Court
- Lead counsel in multiple post-grant review trials before the PTAB, where he has successfully prosecuted inter partes review petitions to Final Written Decision
Before joining the firm, Marshall worked as a clerk in the U.S. District Court for the Northern District of Illinois. Before attending law school, Marshall participated in research projects at Argonne National Laboratory and Amoco Chemicals Corporation.
Representative matters include:
- Helped extend the precedential impact of Batson v. Kentucky, 479 U.S. 79 (1986), to all cases pending on direct appeal
- Wrote amicus brief cited in unanimous opinion invalidating postal laws banning the mailing of unsolicited advertisements for condoms
- Member of trial team on multiple trials regarding the largest government default at the time
- Obtained rare finding of unclean hands that resulted in jury verdict being vacated in patent infringement action
- Lead trial lawyer in inter partes proceeding that led to initial decision on the collateral estoppel effect of a decision not to institute an inter partes review on the basis that a ground is redundant
- Lead counsel in two of the first inter partes review proceedings to reach final written decision
- Lead counsel in inter partes proceeding giving rise to rare precedential decision holding that assignor estoppel does not apply in inter partes proceedings
- Lead counsel in one of the first appeals to clarify the United States Supreme Court decision in In re Cuozzo
Credentials
- Harvard Law School, Juris Doctor (J.D.), Member, Harvard Legal Aid Bureau, 1983, cum laude
- University of Chicago, Bachelor of Science (B.S.), Chemistry, Phi Beta Kappa, 1980, cum laude
- Illinois
- United States Patent and Trademark Office
- United States Court of Appeals, Federal Circuit
- United States Court of Appeals, Seventh Circuit
- United States Court of Federal Claims
- United States District Court, District of Colorado
- United States District Court, Northern District of Illinois
- United States District Court, Northern District of Indiana
- United States District Court, Eastern District of Michigan
- United States District Court, Western District of Michigan
- United States District Court, Western District of Wisconsin
- Named Rotarian of the Year by the Rotary International District 6450, Inc., 2019-2020
- Best Lawyers®, Patent Law, 2016-Present
- The Midwest’s Best Lawyers©, Patent Law, 2021
- Selected to Intellectual Property Litigation, Intellectual Property Super Lawyers, Super Lawyers®, 2012-2024
Engagement
- Member, Federal Circuit Bar Association
- Member, American Intellectual Property Law Association
- Member, Intellectual Property Law Association of Chicago
- Member, American Bar Association, Litigation, Intellectual Property and Antitrust Law Sections
- Member, Illinois State Bar Association, Former Chair, Antitrust and Unfair Competition Section Council
- Member, Chicago Bar Association
- President, Rotary Club of Chicago, 2019-2020; Member, 2010-present; Member, Board of Directors and Service Chair, 2012-Present
- Member, Downers Grove Rotary Club, 1999-2010
- Member, Downers Grove, IL Elementary School District 58 Board of Education, 2001-2009; Vice President, Chair of Policy Committee, 2005-2009
- Member, Board of Control of SAED, DuPage County special education cooperative, 2001-2009; Chair of Board, 2007-2009
Insights

Michael Best Attorneys Earn Recognition in The Best Lawyers in America 2026 List
Michael Best is proud to announce the selection of 104 firm attorneys to The Best Lawyers in America 2026 list, with representation across 48 different areas of legal practice nationwide.Read
Aug 21, 2025

“Enablement” to Obtain a Patent Differs from “Enablement” to Invalidate a Patent
Agilent Technologies, Inc. v. Synthego Corp. (Fed. Cir., June 11, 2025) illustrates how a word in the law can mean different things in different contexts….Read
Jul 3, 2025

Patent Office Expands Discretionary Denials with New “Laches” Fintiv Factor
On June 6, 2025, the Acting Director of the Patent Trial and Appeal Board (“the PTAB”) denied five petitions filed by iRhythm Technologies, Inc. (“iRhythm”) for inter partes review of four related patents (“the Petitions”).Read
Jun 16, 2025
