Irwin IP Converts To Partnership, Welcomes Three Seasoned Litigators As Partners

Irwin IP LLC was founded by Barry Irwin in 2014.  Since its founding, Irwin IP has developed a thriving intellectual property litigation practice.  Irwin IP is pleased to announce that, effective January 1, 2023, it will be converting to a partnership, and that Lisa Holubar, Mike Bregenzer, and Jason Keener will be joining Barry as partners. Both Lisa and Mike were previously partners, with Barry, at the top ranked AmLaw 100 law firm. 

Lisa Holubar
Mike Bregenzer
Jason Keener

Lisa has been with Irwin IP since its establishment, and she leads the firm’s Trademark and Advertising Litigation practice.  In addition to her extensive litigation experience, Lisa counsels clients on all aspects of selecting, protecting, and enforcing their trademarks.  Lisa also aids clients in connection with various related matters including UDRP arbitration and website and advertising review. 

Mike’s relationship with Irwin IP started about the same time as Lisa’s when, as General Counsel for Ranir—a manufacturer of medical devices and OTC pharmaceuticals— he retained Irwin IP to handle a bet-the-company IP litigation against Proctor & Gamble.  After retaining Irwin IP on several additional IP litigation matters, and after Ranir’s acquisition by publicly traded Perrigo, Mike joined Irwin IP in 2020 as a Senior Attorney.  Since then, Mike has been managing a significant portion of the firm’s patent litigation business. 

Jason joined Irwin IP a year ago as a Senior Attorney, proving quickly that he is a fantastic attorney and rapidly becoming a firm leader.  In addition to bringing his broad ranging intellectual property litigation experience to the firm’s existing clients, he has also brought with him and has continued to attract a range of clients across the IP litigation landscape.

“I am extremely proud to see Irwin IP take this next step and to partner with Lisa, Mike, and Jason.  They are all fantastic attorneys and have contributed substantially in the growth of Irwin IP,” Barry Irwin commented regarding their elevation to partner.  “I look forward to seeing how the firm continues to grow and prosper with their leadership.”

Irwin IP concentrates on mission-critical, high-profile intellectual property and technology-related litigation.  Our clients range from Fortune 500 companies to pioneering startups.  We have enforced intellectual property portfolios protecting product lines generating hundreds of millions of dollars annually.  We have also cleared the way for our clients to sell such product lines.  We routinely, successfully litigate against the largest, most prestigious law firms representing the largest companies in the world on matters valued in the tens and hundreds of millions.

Barry Irwin

Barry has been litigating mission-critical, high-profile intellectual property and technology matters in federal courts across the country for nearly 30 years.  In addition to his active litigation practice, Barry has been an Adjunct Professor at Notre Dame Law School for nearly a decade, where he teaches both Patent Litigation and Entertainment Law.  Barry is also the Board President of Lawyers for the Creative Arts, a former executive board member of the Linn Inn American Inn of Court, and long-term member of the Village of Burr Ridge Planning Commission and Zoning Board of Appeals. 

Barry was just recently named by Best Lawyers® as the 2023 “Lawyer of the Year” for both “Litigation – Patent” and “Copyright Law” in Chicago, an honor bestowed on just a single lawyer in each practice area and designated metropolitan area.  In 2018, Barry was selected by Thomson Reuters as one of the Top 100 lawyers in Illinois as part of its Super Lawyers selection process, one of only eight intellectual property attorneys on the list, and the only one from a small (under 75 attorney) intellectual property boutique.  And, each year, for nearly twenty years, Barry has been named a Leading Lawyer and a Super Lawyer.  Barry also received Martindale Hubbell’s highest ratings (AV, AV+ and AV Preeminent) in his first years of eligibility and each year thereafter.

Learn more about our practice at

All firm email and phone numbers remain the same, as well as our location of 150 N Wacker.