William Lambert is a partner in the Intellectual Property Practice Group in the firm's Silicon Valley office.

Areas of Practice

Dr. Lambert is a Partner in the Intellectual Property Group in Sheppard Mullin’s Silicon Valley office.  He is a registered patent attorney who focuses his practice on patent prosecution and client counseling including the validity, infringement, and freedom-to-operate opinions.  He has expertise in the  chemical, pharmaceutical, biomedical, material science, polymer science, electronics, photonics, optoelectronics, semiconductor and alternative energy industries, working with clients ranging from start-ups to Fortune 100 companies

Dr. Lambert has practiced patent law for 13 years in Silicon Valley.  He has also worked as  patent counsel for a Bay Area pharmaceutical start-up company, co-founded a start-up  electronic packaging company, and was a member of the technical staff with AT&T/Lucent Technologies Bell Laboratories at Murry Hill for 17 years.




American Association for the Advancement of Science, Member

American Bar Association, Member

American Chemical Society, Member

Silicon Valley Intellectual Property law Association, Member


J.D., University of New Hampshire

Ph.D., Chemical Physics, California Institute of Technology

B.A., Biochemistry, University of California, Berkeley


  • California
  • U.S. Court of Appeals for Veterans Claims
  • U.S. Patent and Trademark Office
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