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Kenneth A. Clark
Partner
Corporate
Palo Alto
San Diego
kclark@wsgr.com

D650-320-4742

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  • Experienced Legal Advisor to Biotech Companies

    Ken acts as outside general counsel to biotechnology companies and their boards of directors.

  • Substantial Transactions Experience

    Ken has negotiated more than 100 major strategic alliance and M&A transactions. In addition to partnering agreements and strategic transactions, Ken represents companies in financings, spin-outs, and other deals.

  • A Recognized Practitioner

    Ken has been recognized in Chambers USA as one of the top biotechnology attorneys in the U.S.

Ken Clark serves as general counsel to companies and their boards of directors, primarily in the biotechnology industry. Ken has extensive expertise in partnering and strategic transactions, having negotiated more than 100 major strategic alliance and M&A transactions. He also regularly represents companies in financings, spin-outs, and related matters.

Ken served on the firm's board of directors from 2011 to 2014 and from 2002 to 2006, and previously was a member of the firm's Policy Committee. Ken served as a director of Pharmacyclics, Inc. (NASDAQ: PCYC) from 2012 until their sale to AbbVie in 2015.

Experience

Ken Clark serves as general counsel to companies and their boards of directors, primarily in the biotechnology industry. Ken has extensive expertise in partnering and strategic transactions, having negotiated more than 100 major strategic alliance and M&A transactions. He also regularly represents companies in financings, spin-outs, and related matters.

Ken served on the firm's board of directors from 2011 to 2014 and from 2002 to 2006, and previously was a member of the firm's Policy Committee. Ken served as a director of Pharmacyclics, Inc. (NASDAQ: PCYC) from 2012 until their sale to AbbVie in 2015.

Education
  • J.D., University of Texas School of LawOrder of Coif; Chancellor's Order; Articles Editor, Texas Law Review
  • B.A., Vanderbilt UniversityMagna Cum Laude, Phi Beta Kappa
Admissions
  • State Bar of California
Credentials
Education
  • J.D., University of Texas School of LawOrder of Coif; Chancellor's Order; Articles Editor, Texas Law Review
  • B.A., Vanderbilt UniversityMagna Cum Laude, Phi Beta Kappa
Admissions
  • State Bar of California

Select Transactions

  • Affymax/NektarTherapeutics
  • Alector/AbbVie
  • Alector/GSK
  • Alector/Innovent
  • Amicus/GSK
  • Amicus/Shire Pharmaceuticals
  • Amgen/Xencor
  • Amgen/GSK
  • Aragon/Johnson & Johnson
  • Array/Amgen
  • Array/Novartis
  • Calistoga Pharmaceuticals/Gilead
  • Cell Genesys/Hoescht
  • Cell Genesys/Japan Tobacco, Inc.
  • Cytokinetics/Amgen
  • Cytokinetics/GlaxoSmithKline
  • CytomX/BMS
  • CytomX/Pfizer
  • Denali Therapeutics/Takeda
  • Dren/Pfizer
  • Genentech/Biogen
  • Genta/Aventis
  • IGM/Sanofi
  • Inviragen/Takeda
  • Lyell/GSK collaboration
  • Macusight/Santen
  • Maverick Therapeutics/Takeda
  • Nanjing Legend Biotech/Janssen
  • ParAllele/Affymetrix
  • Peloton Therapeutics/Merck
  • Pharmacyclics/Janssen Biotech
  • Pharmacyclics/AbbVie
  • Quanticel/Celgene
  • Rinat/Pfizer
  • SARCode/Shire
  • Sequenta/Adaptive Biotechnologies
  • Seragon/Genentech
  • Stromedix/Biogen
  • Sunesis Pharmaceuticals/Biogen
  • Synthekine/Merck
  • Taiho Pharmaceutical Co. Ltd./Merck
  • Taiho Pharmaceutical Co. Ltd./Servier
  • Taiho Pharmaceutical Co. Ltd./Helsinn SA
  • Taiho Pharmaceutical Co. Ltd./American Bioscience
  • Taiho Pharmaceutical Co. Ltd./Sanofi Aventis
  • Taiho Pharmaceutical Co. Ltd./Arcus Bioscience
  • Tercica/Genentech
  • VentiRx/Celgene
  • Vividion/Roche
  • Vivus/Astra
  • XenoPort/Astellas Pharma, Inc.
  • XenoPort/GlaxoSmithKline
Matters

Select Transactions

  • Affymax/NektarTherapeutics
  • Alector/AbbVie
  • Alector/GSK
  • Alector/Innovent
  • Amicus/GSK
  • Amicus/Shire Pharmaceuticals
  • Amgen/Xencor
  • Amgen/GSK
  • Aragon/Johnson & Johnson
  • Array/Amgen
  • Array/Novartis
  • Calistoga Pharmaceuticals/Gilead
  • Cell Genesys/Hoescht
  • Cell Genesys/Japan Tobacco, Inc.
  • Cytokinetics/Amgen
  • Cytokinetics/GlaxoSmithKline
  • CytomX/BMS
  • CytomX/Pfizer
  • Denali Therapeutics/Takeda
  • Dren/Pfizer
  • Genentech/Biogen
  • Genta/Aventis
  • IGM/Sanofi
  • Inviragen/Takeda
  • Lyell/GSK collaboration
  • Macusight/Santen
  • Maverick Therapeutics/Takeda
  • Nanjing Legend Biotech/Janssen
  • ParAllele/Affymetrix
  • Peloton Therapeutics/Merck
  • Pharmacyclics/Janssen Biotech
  • Pharmacyclics/AbbVie
  • Quanticel/Celgene
  • Rinat/Pfizer
  • SARCode/Shire
  • Sequenta/Adaptive Biotechnologies
  • Seragon/Genentech
  • Stromedix/Biogen
  • Sunesis Pharmaceuticals/Biogen
  • Synthekine/Merck
  • Taiho Pharmaceutical Co. Ltd./Merck
  • Taiho Pharmaceutical Co. Ltd./Servier
  • Taiho Pharmaceutical Co. Ltd./Helsinn SA
  • Taiho Pharmaceutical Co. Ltd./American Bioscience
  • Taiho Pharmaceutical Co. Ltd./Sanofi Aventis
  • Taiho Pharmaceutical Co. Ltd./Arcus Bioscience
  • Tercica/Genentech
  • VentiRx/Celgene
  • Vividion/Roche
  • Vivus/Astra
  • XenoPort/Astellas Pharma, Inc.
  • XenoPort/GlaxoSmithKline
Focus Areas
  • Biotech
  • Capital Markets
  • Corporate
  • Corporate Governance
  • Life Sciences
  • Technology Transactions
Recent Insights
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Wilson Sonsini Practices, Attorneys Recognized in 2026 Chambers USA Guide
The 2026 Chambers USA guide has recognized Wilson Sonsini Goodrich & Rosati as a leading law firm in 44 geography-specific practice categories and named 87 Wilson Sonsini attorneys among the best in their fields. This year, the firm received four new practice area rankings, including in the nationwide National Security and Capital Markets: Convertible Debt categories, and three improved practice area rankings.
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Wilson Sonsini, Attorneys Recognized in 2026 IAM Patent 1000
On May 28, 2026, IAM 1000 recognized Wilson Sonsini in the 2026 edition of IAM Patent 1000. The firm earned three rankings, and five Wilson Sonsini attorneys received individual recommendations.
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