Guy Sereff Photo

Guy B. Sereff, CIPP/US

Senior Counsel


Guy counsels clients on privacy and data security matters including compliance with U.S. and E.U. data protection and privacy laws, the development of company privacy programs, and responding to and mitigating data breaches.

He also helps clients negotiate, draft, and review a variety technology licenses and contracts. Guy has negotiated hundreds of technology transactions involving a wide range of issues including software licensing, cloud hosting, and IT services. Additionally, Guy advises clients on drafting and implementing website terms of service and rules for online sweepstakes.

His experience includes more than seven years serving as in-house counsel, where he gained valuable knowledge into the day-to-day and significant privacy and cybersecurity concerns businesses face. Guy understands his clients’ needs for practical solutions to these often complex problems.


  • Designed and oversaw the development and implementation of a global privacy program for a large global telecommunications company.
  • Negotiated a software license agreement between an online player management and casino platform provider and an online sportsbook provider to integrate their offerings and make the integrated offering available to online gaming operators.
  • Represented a large, publicly traded casino and entertainment company in its licensing of a hosted online gaming suite of applications, including sports betting, gaming, online casino, and player account management functionalities for use in support of its online and mobile gaming and sports betting offerings in multiple jurisdictions in the U.S. Guy also secured rights allowing the client to integrate such applications with a third party’s digital sports betting front end user interface to make the applications available to end users.
  • Negotiated transactions between an online sportsbook and casino operator and online payment service providers to enable the online sportsbook and casino operator to offer patrons a variety of online payment methods.
  • Advised a large global cosmetics retailer on the development and implementation of a privacy program that addressed obligations under both E.U. and U.S. privacy laws.
  • Provided guidance to a start-up technology provider in the mortgage and real estate industry on potential privacy issues and developed corresponding mitigation strategies.

Before joining Michael Best, Guy practiced with a Denver-based national law firm.

He previously served as Associate General Counsel and Data Protection Officer at global telecommunications company CenturyLink, where he helped develop the business’ privacy compliance programs. In this role, he established and oversaw the implementation of protective measures for personal data under the European Union General Data Protection Regulation (GDPR) and other international regulations governing data privacy.

Earlier in his career, Guy was Vice President and Associate Counsel at Urban Lending Solutions, was responsible for policy development.

Between 2011-2018, Guy also was a professor at Washington and Lee University School of Law, where he taught a practice-based course for third-year law students on issues in privacy, intellectual property, cybercrime, data security, and internet governance.

Professional Activities

  • Member, American Bar Association
  • Member, International Association of Privacy Professionals





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