Paul Sieben

Ian Ballon is an intellectual property and Internet litigator who represents clients in copyright, DMCA, trademark, trade secret, right of publicity, privacy, security, software, database and Internet disputes and in the defense of data privacy, behavioral advertising and other Internet-related class action suits. Mr. Ballon, who splits his time between the firm's Silicon Valley and LA offices, is the author of the four-volume legal treatise, E-Commerce and Internet Law: Treatise With Forms 2...

Michael D. Celio is a top attorney recognized by Best Lawyers in the practice area(s) of Litigation - Securities. Michael D., who practices law in Palo Alto, California, has been recognized since 2023. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Michael D. is held by other top lawyers in the same geographic and legal practice area.

David Jakopin is a top attorney recognized by Best Lawyers in the practice area(s) of Litigation - Intellectual Property. David, who practices law in Palo Alto, California, has been recognized since 2025. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which David is held by other top lawyers in the same geographic and legal practice area.

Judy Mohr, PhD, helps companies maximize product protection and intellectual property (IP) value by focusing on the business goals of the company and designing a patent portfolio to meet those objectives. Her practice encompasses US and non-US patent procurement, post-grant proceedings (including reexamination and inter partes review), IP due diligence on the investor side and the company side, negotiation of agreements, and development of IP strategies. She assists companies in the pharmaceu...

Steven Ellenberg is a top attorney recognized by Best Lawyers in the practice area(s) of Commercial Litigation and Litigation - Trusts and Estates. Steven, who practices law in San Jose, California, has been recognized since 2021. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Steven is held by other top lawyers in the same geographic and legal practice area.

Allison M. Leopold Tilley is a top attorney recognized by Best Lawyers in the practice area(s) of Corporate Law and Mergers and Acquisitions Law. Allison M. Leopold, who practices law in Palo Alto, California, has been recognized since 2013. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Allison M. Leopold is held by other top lawyers in the same geographic and legal practice area.

James F. Valentine is a top attorney recognized by Best Lawyers in the practice area(s) of Litigation - Intellectual Property and Litigation - Patent. James F., who practices law in Palo Alto, California, has been recognized since 2018. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which James F. is held by other top lawyers in the same geographic and legal practice area.

Recognized as one of California’s top trial lawyers, Elizabeth focuses her practice on technology, trade secrets, business disputes, and civil rights. She also manages day-to-day operations of the firm. A courtroom veteran, Elizabeth brings keen strategic thinking to every step of litigation. In addition to her trial work, she has handled many sensitive investigations and frequently assists clients in risk management. Clients have described Elizabeth as “an excellent trial lawyer&...

Sean Breen is trial attorney and a partner at Howry, Breen & Herman LLP. Sean has won several Hall of Fame and Record setting verdicts and secured hundreds of millions of dollars in settlements. Sean has extensive litigation and trial experience aggressively handling and winning a broad range of cases. Mr. Breen is licensed in Texas and Colorado has over 25 years of experience representing individuals and businesses as a trial lawyer. He is recognized as one of the top trial attorneys in ...

Phil Levine is head of the firm's Northern California Real Estate Group. Mr. Levine concentrates his practice representing clients in a wide range of commercial real estate equity and debt transactions, including acquisitions and sales; financing (including permanent and construction loans); the structuring and formation of joint ventures and other investment vehicles for the development, ownership, and operation of all major property types, such as multifamily projects, office buildings, and...