Z. Ying Li

Steptoe & Johnson LLP

Ying Li counsels biotechnology and pharmaceutical clients on patent portfolio management and strategic development. She has extensive experience in patent prosecution worldwide. Ying helps clients survey competitive patent landscapes and renders opinions of counsel on freedom to operate, non-infringement, and patent invalidity. She also conducts IP due diligence for venture capital investment and corporate business development.

Ying has worked on a wide range of therapeutic areas including cancer and immune disorders, with particular experience in biologics such as antibody therapeutics, as well as molecular diagnostics, vaccines, and RNA interference. She assists clients with pre-litigation strategy counseling and freedom to operate analyses concerning application of the Biologics Act to biotherapeutic development programs.

Ying also has extensive experience in contentious matters before US and foreign patent offices, and has represented clients in matters related to transgenic animals and immune molecules. She successfully argued for an interference appellee before the Court of Appeals for the Federal Circuit in a case of first impression related to conception of recombinant DNA.

During her doctoral research, Ying discovered a novel gene involved in DNA double-stranded break repair and antibody gene rearrangement.

Bar & Court Admissions:

  • New York
  • US District Court, Eastern District of New York
  • US District Court, Southern District of New York
  • US Court of Appeals, Federal Circuit
  • US Patent & Trademark Office


  • J.D., Fordham University School of Law, 2002, cum laude; Order of the Coif; The Senior Prize
  • Ph.D., Harvard University, 1996, Immunology
  • B.A., Smith College, 1990, magna cum laude; with Highest Honors in Biochemistry


Rate : $$$

What types of cases Attorney Z. Ying Li & Steptoe & Johnson LLP can handle?
Steptoe & Johnson LLP can handle cases related to laws concerning Corporate, Business. We manually verify each attorney’s practice areas before approving their profiles and reviews on our website.
Where is Steptoe & Johnson LLP located?
Steptoe & Johnson LLP is located at 17, 1114 6th Ave, New York, NY 10036, USA. You can reach out to Steptoe & Johnson LLP using their phone line +1 212 506 3912. You can also check their website steptoe.com.
How much would it cost to hire Steptoe & Johnson LLP?
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Steptoe & Johnson LLP
6th Avenue 1114
New York 10036 NY US
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Main Street 71-18
11367 NY US

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