William Long

William Long advises international clients on a wide variety of social media, data protection, privacy, information security, e-commerce and other regulatory matters. William has experience with EU and international e-commerce, consumer, social media, data protection and payments projects, advising on e-commerce, consumer and social media regulation, data security and other data protection issues. He is a regular speaker on social media, data protection and e-commerce matters.
William is a co-founder of the Social Media Governance Forum, a networking group of companies involved in social media, and was previously in-house counsel to one of the world’s largest international financial services groups as their e-commerce counsel establishing Interactive Investor which is one of the world’s largest online consumer financial services businesses with over 8 million users.

He has been a member of a number of working groups in London and Europe looking at the EU regulation of e-commerce and data protection and spent a year at the UK’s Financial Law Panel (established by the Bank of England), as assistant to the Chief Executive working on regulatory issues with online financial services.
Contributed to


Conducting clinical research—data protection implications
Practice notes

This Practice Note explores the data protection implications of conducting clinical research. In particular, this Practice Note considers the responsibility for data protection compliance in the context of clinical research, the relevant legal grounds for processing personal data for research purposes, transparency requirements, collaborative research and data sharing as well as exceptions to data subject rights when processing personal data in the context of research. Finally, this Practice Note provides a checklist of practical data protection considerations to bear in mind when planning research activities.

mHealth—data protection considerations
Practice notes

This Practice Note focuses on the data protection considerations and implications of mobile health (mHealth). mHealth is a subset of eHealth (ie the use of information and communication technologies for health) and refers to the use of mobile applications to allow users to monitor, evaluate and improve their health using their mobile devices.

Practice areas


  • Association of Privacy Professionals European Board


  • Contributing Author
  • Other Publications


  • Queen Mary College, London (LL.B., 1989)

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