David is an accomplished IP attorney with over 15 years of experience prosecuting, advising, and litigating in various technology areas, including pharmaceuticals, chemical, biologics, diagnostics, gene editing, and medical devices.
David specializes in patent litigation, including litigating many high-profile and billion-dollar patent cases in district court litigation, Federal Circuit appeals, and Patent Trial and Appeal Board (PTAB) proceedings. David has counseled his clients through all aspects of litigation, including arguing claim construction and discovery-related issues before the Court, taking and defending dozens of fact and expert depositions, and taking numerous direct and cross examinations of expert witnesses at trial. In the top law firm directory The Legal 500 US, a client recommended David, noting his client service for being “super responsive and very detail oriented.”
In particular, David has extensive experience litigating pharmaceutical patent matters under the Biologics Price Competition and Innovation Act (BPCIA) and Hatch-Waxman Act, including representing patentees, biosimilars, and generic filers. His representative BPCIA matters include litigating Prolia® (denosumab), Xgeva® (denosumab), Stelara® (ustekinumab), Avastin® (bevacizumab), Herceptin® (trastuzumab), and Rituxan® (rituximab).
His representative Hatch-Waxman / ANDA matters include litigating Suboxone® (buprenorphine naloxone), Pradaxa® (dabigatran etexilate), Ultiva® (remifentanil hydrochloride), Daytrana® (methylphenidate), Dymista® (azelastine HCl/fluticasone propionate), Epaned® (enalapril maleate), and Brisdelle® (paroxetine).
In addition, David has represented a major pharmaceutical company in product liability matters relating to Viread®, Truvada®, Atripla®, and other antiviral medications containing tenofovir disoproxil fumarate (TDF).
David also maintains an active pro bono practice focusing on advocating for LGBTQ+ equality. He has filed administrative complaints under the Federal Tort Claims Act, prepared and filed asylum applications and supporting documentation, and submitted petitions for legal name changes.
Prior to joining Mintz, David was a senior counsel in the Litigation Department’s Life Sciences Group at an international law firm. Earlier, he practiced at another global law firm.
In law school, David served as the lead article editor of the Minnesota Journal of Law, Science & Technology.
News & Press
The Best Lawyers in America 2025 Recognizes 184 Mintz Attorneys across 56 Practice Areas
August 15, 2024
187 Mintz attorneys have been recognized by Best Lawyers® in the 2025 edition of The Best Lawyers in America©. Notably, three Mintz attorneys received 2025 “Lawyer of the Year” awards, and 64 firm attorneys were included in the 2025 edition of Best Lawyers: Ones to Watch.
Firm Grows Life Sciences Group in LA
May 20, 2024
The Los Angeles Business Journal covered the arrival of Siegmund Gutman, Life Sciences Litigation Chair and Patent Litigation Co-chair. Sige leads an 11-attorney team including Member David Hanna, which has joined Mintz’s offices in Boston, Los Angeles, and New York.
A leading life sciences patent litigation team has joined Mintz. The team is led by Siegmund (“Sige”) Gutman, who will serve as Member, Chair of Life Sciences Litigation, and Co-chair of Patent Litigation. Sige is joined by Member David Hanna and nearly a dozen attorneys based in Los Angeles, Boston, and New York.
Recognition & Awards
Best Lawyers in America: Ones to Watch (2021 – 2025)
The Legal 500 United States: Healthcare: Life Sciences (2020)
Included on the Southern California Super Lawyers – Rising Stars list (2020 – 2024)
Federal Circuit Bar Association: Global Fellow (2022 – 2023)
Involvement
- Member at Large, Executive Committee, Southern California Section of the American Chemical Society (SCALACS)
- Member, American Chemical Society
- Member, LGBTQ+ Lawyers Association of Los Angeles
- Board Member, Echo Theater Company