Mark Windfeld-Hansen


Almost every deal has tax implications. I work side by side with the transaction team from the outset.

+1 650 843 5111

Mark's practice focuses on tax issues arising in business transactions and executive compensation, with particular emphasis on the tax concerns of emerging growth companies and their executives. He advises clients on federal and state tax issues in M&A (domestic and cross-border), spin-offs, restructurings, equity and debt financings, leveraged buy-outs, limited liability companies and other pass-through entities, liquidations and other significant transactions. He has been the lead tax lawyer on a large number of high-profile transactions for clients such as Yahoo, Seagate, Macrovision, Oracle, Collagen, Aspect Communications and RITA Medical Systems, and he has represented the selling company in numerous acquisitions by some of the world's most active buyers, such as Cisco Systems, Microsoft, Boston Scientific, IBM, AOL, Intel, Nokia, Qualcomm and Alcatel. In the past 1 1/2 years, he has been the principal tax lawyer on 80+ acquisitions having an aggregate value in excess of $10 billion (see recent representative transactions below).

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  • Vir Biotechnology - $143 Million IPO 

  • SendGrid Sells to Twilio for $2 Billion 

  • The Honest Company Secures $200 Million From L Catteron 

  • ConvergeOne Announces $1.2 Billion Combination With Forum Merger to Become Public Company 

  • Cell Design Labs Sells to Gilead 

  • View all

Practices & Industries


  • Yale Law School
    JD, 1982

  • Amherst College
    BA, History
    summa cum laude, 1978

Admissions & Credentials


Rankings & Accolades

    Best Lawyers in America: Tax Law

    Legal 500 US: Domestic Tax (2015)


+1 650 843 5111 office
+1 650 618 2055 fax

3175 Hanover Street
Palo Alto, CA 94304-1130