William Long




WILLIAM LONG is a partner in the London office of international law firm Sidley Austin LLP and advises international clients on a wide variety of data protection, privacy, information security, social media, e-commerce and other regulatory matters. William has been a member of the European advisory board of the IAPP. William is recognized in Chambers UK 2014 for Data Protection, with sources telling the publication he "is clearly a subject matter expert" and that "he is able to give quick advice and was timely and responsive. He is very personable, pleasant to work with and down to earth." Most recently William is recognized in the LMG Life Sciences for intellectual property.

William is also on the editorial board for eHealth Law & Policy and eFinance & Payments Law & Policy and is on the DataGuidance panel of data protection lawyers. He is a contributor to a number of books on data protection including leading legal text books published by BNA in the area of privacy including ones on cloud computing and the use of health data. William is also a contributor to a major global survey of Privacy, Data Protection and Cybersecurity law covering 62 international jurisdictions published by Law Business Research. He has also been interviewed widely for his thought leadership, including in such leading publications as the International New York Times and writes for a number of publications including Computer Weekly, Cloud Pro and CIO Today.


Contributions by William Long

  • How big will big data be under the GDPR?
    The Privacy Advisor
  • Dealing with the GDPR’s New Data Protection Rights in Practice
    Moderator at IAPP Europe Data Protection Intensive 2016
  • Impact of the European Data Protection Regulation on California Business
    Speaker at Los Angeles, CA KnowledgeNet: July 14, 2015
  • How to Implement the Data Protection Regulation in Practice
    Speaker at IAPP Europe Data Protection Intensive 2015