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Hanson Bridgett LLP

William T. Kellermann

William T. Kellermann


Hanson Bridgett LLP
California, U.S.A.

tel: 415-995-5829
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A technology lawyer and litigator for more than 25 years, Bil helps clients execute sound and defensible identification, preservation, collection, review and production of electronically stored information for use as evidence in litigation and investigations. Matters included patent, IP, securities, white-collar criminal, commercial and employee mobility/trade-secret litigation and investigations. In addition, he assists enterprises with litigation readiness and information governance counseling focused on defensible retention and disposition programs, and structured legal hold and litigation response systems for pattern litigants in the technology and life sciences industries.

Bil's expertise includes using software to automate preservation, discovery, case assessment, and trial preparation. He is a frequent speaker on electronic evidence topics.

Bar Admissions

  • California
  • U.S. Court of Appeals for the Ninth Circuit
  • U.S. District Court for the Northern District of California
  • U.S. District Court for the Central District of California
  • U.S. District Court for the Eastern District of California
  • U.S. District Court for the Southern District of California


J.D., University of San Francisco School of Law (1990)
B.S., San Francisco State University (1986)
Areas of Practice
Professional Career

Significant Accomplishments

Advised global semiconductor company on the effect of data security monitoring and investigation practices on EU Safe Harbor Certification.

Advised American subsidiary of European company regarding US Government access to EU hosted cloud content under Patriot Act procedures (National Security Letters or FISC subpoenas).

Professional Associations

  • State Bar of California, Law Practice Technology Section
  • Curriculum Steering Committee, Arizona State University School of Law, Arkfeld Electronic Discovery Conference, Member
  • International Legal Technology Association, Member
  • Electronic Discovery Task Force, Santa Clara County Bar Association, Member
  • International Association of Privacy Professionals

Drone Law Blog
Hanson Bridgett LLP 

Commercial Drone Use In California - A Legal Blog

HB Briefly
Hanson Bridgett LLP 

Briefly is designed to provide readers with updates on the latest litigation developments in California. Our focus is on general litigation as well as issues surrounding class actions, products liability, discovery, privacy, cybersecurity, and the professional practice of law.


"6 Often-Overlooked Cloud Security Considerations," Legaltech News (December 2016)
"California Attorney General Sets New Minimum Standard of Care for Data Privacy & Security," co-author, USLAW Magazine (Fall/Winter 2016)
"Third Circuit Affirms FTC Authority to Regulate Cybersecurity," Data Security Law Alert (September 2015)
"NCCoE Releases Draft of First Cybersecurity Practice Guide," Cyberspace Law e-Bulletin (August 2015)
"How A Data Breach Led To A ‘Billboard Bomb,’" Technology Law Alert (June 2015)
“Social Media Discovery,” Minnesota State Bar Journal (November 2010)
"Synching Up Systems for Compliance & Litigation Readiness," BusinessWeek (March 2005)

WSG's members are independent firms and are not affiliated in the joint practice of professional services. Each member exercises its own individual judgments on all client matters.

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