Cynthia Lock Tregillis

Deputy General Counsel – Contracts, Products and Intellectual Property at Western Digital Corporation

Cynthia Tregillis is the deputy general counsel of contracts, products and intellectual property for Western Digital Corporation, which is a global data infrastructure leader that markets its products under the G-Technology, SanDisk and WD brands. Ms Tregillis currently manages the legal department’s teams with responsibility over commercial transactions and business support, product development, marketing and intellectual property. Her team is located in the United States, Europe, Israel, India, Japan, China, Thailand, Singapore and Malaysia.

Ms Tregillis established the trademark and brand protection group for Western Digital in October 2012. From December 2015 until September 2016, Ms Tregillis was the interim chief IP counsel with global responsibility for development of Western Digital’s patent portfolio, trademark portfolio and trade secrets and brand protection programmes. With the acquisition of SanDisk, Ms Tregillis was named vice president of global brand protection and trademarks for all of Western Digital’s brands, a position she held until she became deputy general counsel.

Under Ms Lock Tregillis’s leadership, Western Digital was presented with the Technology and Consumer Electronics Industry Team of the Year Award in 2014 and 2017. In June 2017 she was awarded the Americas Women in Business Law Managing IP In-House Award by Managing Intellectual Property

Ms Tregillis is the chair for the USC IP Institute, an annual conference established 15 years ago that addresses cutting-edge topics in IP law. Ms Tregillis is the first female chair and first in-house chair of the institute.

Prior to joining Western Digital, Ms Tregillis was an attorney of counsel working in the Orange County and Los Angeles offices of Orrick, Herrington & Sutcliffe LLP, and a partner at McDermott Will & Emery LLP and Oppenheimer, Wolff & Donnelly LLP. Ms Tregillis’ private practice focused on trademark infringement and patent infringement cases in federal court and before the International Trade Commission.

Professional associations

  • IACC
  • INTA
  • LES
  • USC Gould School of Law


  • Technology

Firm details

Western Digital Corporation
Irvine CA and San Jose CA
United States

Contact details