For more than four decades, Fenwick & West LLP has helped some of the world’s most recognized companies become, and remain, market leaders. From emerging enterprises to large public corporations, our clients are leaders in the technology, life sciences and cleantech sectors and are fundamentally changing the world through rapid innovation.  MORE >

Fenwick & West was founded in 1972 in the heart of Silicon Valley—before “Silicon Valley” existed—by four visionary lawyers who left a top-tier New York law firm to pursue their shared belief that technology would revolutionize the business world and to pioneer the legal work for those technological innovations. In order to be most effective, they decided they needed to move to a location close to primary research and technology development. These four attorneys opened their first office in downtown Palo Alto, and Fenwick became one of the first technology law firms in the world.  MORE >

From our founding in 1972, Fenwick has been committed to promoting diversity and inclusion both within our firm and throughout the legal profession. For almost four decades, the firm has actively promoted an open and inclusive work environment and committed significant resources towards improving our diversity efforts at every level.  MORE >

FLEX by Fenwick is the only service created by an AmLaw 100 firm that provides flexible and cost-effective solutions for interim in-house legal needs to high-growth companies.  MORE >

Fenwick & West handles significant cross-border legal and business issues for a wide range of technology and life sciences who operate internationally..  MORE >

At Fenwick, we are proud of our commitment to the community and to our culture of making a difference in the lives of individuals and organizations in the communities where we live and work. We recognize that providing legal services is not only an essential part of our professional responsibility, but also an excellent opportunity for our attorneys to gain valuable practical experience, learn new areas of the law and contribute to the community.  MORE >

Year after year, Fenwick & West is honored for excellence in the legal profession. Many of our attorneys are recognized as leaders in their respective fields, and our Corporate, Tax, Litigation and Intellectual Property Practice Groups consistently receive top national and international rankings, including:

  • Named Technology Group of the Year by Law360
  • Ranked #1 in the Americas for number of technology deals in 2015 by Mergermarket
  • Nearly 20 percent of Fenwick partners are ranked by Chambers
  • Consistently ranked among the top 10 law firms in the U.S. for diversity
  • Recognized as having top mentoring and pro bono programs by Euromoney


We take sustainability very seriously at Fenwick. Like many of our clients, we are adopting policies that reduce consumption and waste, and improve efficiency. By using technologies developed by a number of our cleantech clients, we are at the forefront of implementing sustainable policies and practices that minimize environmental impact. In fact, Fenwick has earned recognition in several areas as one of the top US law firms for implementing sustainable business practices.  MORE >

At Fenwick, we have a passion for excellence and innovation that mirrors our client base. Our firm is making revolutionary changes to the practice of law through substantial investments in proprietary technology tools and processes—allowing us to deliver best-in-class legal services more effectively.   MORE >

Mountain View Office
Silicon Valley Center
801 California Street
Mountain View, CA 94041

San Francisco Office
555 California Street
12th Floor
San Francisco, CA 94104

Seattle Office
1191 Second Avenue
10th Floor
Seattle, WA 98101

New York Office
1211 Avenue of the Americas
32nd Floor
New York, NY 10036

Shanghai Office
Unit 908, 9/F, Kerry Parkside Office
No. 1155 Fang Dian Road
Pudong New Area, Shanghai 201204
P.R. China
+86 21 8017 1200

J. David Hadden

Partner, Litigation  

Mountain View 650.335.7684


J. David Hadden focuses his practice on patent and other intellectual property litigation. Dave has a successful nationwide trial practice representing companies in a variety of technologies including ecommerce, cryptography, telecommunications, database management and business intelligence, cloud computing, hardware design, wearable tech, natural language processing, and machine learning. Dave was recently honored as one of the top 75 IP litigation attorneys in California by the Daily Journal, and has been repeatedly ranked as a “Super Lawyer” by Northern California Super Lawyers. He was also recently ranked by IAM Patent 1000 2017 in which he is described as “a hugely experienced litigator and trial attorney who leads teams to excellent results on time and within budget. He is well prepared and appropriately focused, and keeps a global perspective on the merits and impact of a dispute.”

Dave graduated, summa cum laude, Phi Beta Kappa, with honors in physics from Yale University in 1986, and went on to study string theory at Princeton as a National Science Foundation Graduate Fellow. Dave obtained his law degree from Yale Law School in 1994. Following graduation, he was a law clerk for the Honorable Walter J. Cummings, United States Court of Appeals, Seventh Circuit. Dave is a member of the S​tate Bar of California and admitted to practice before the U.S. Patent & Trademark Office and the U.S. Court of Appeals for the Federal Circuit.

In the last year Dave argued 5 Federal Circuit Appeals for clients including Amazon, Intel, Under Armour and Zillow, and won them all.

Recently, Dave secured a summary judgment of non-infringement followed by $820,000 in attorney’s fees for Voxer in a patent dispute with non-practicing entity IPVX Patent Holdings. Originally filed in the Eastern District of Texas by IPVX’s predecessor, Klausner, Dave succeeded in transferring the case to the Northern District of California, where his team’s motion for summary judgment was granted the day after it was argued, with the court finding that Voxer’s push-to-talk voice messaging system could not possibly infringe IPVX’s answering machine patent.

Dave was lead trial counsel for Zillow and Adchemy winning a defense verdict in the Western District of North Carolina against competitor LendingTree. After a five week trial, the jury found that Zillow and Adchemy did not infringe the asserted patents and the patents were invalid.

Dave successfully represented Twitter in a patent infringement action brought by Cooper Notification, obtaining a rare summary judgment in U.S. District Court in Delaware that was affirmed by the Federal Circuit after Dave’s oral argument. In the same year, Dave obtained a summary judgment of non-infringement for Groupon in a five patent case in the Middle District of Florida. The judgment was affirmed on appeal after Dave’s oral argument at the Federal Circuit.

Dave served as trial counsel for winning a defense jury verdict in Delaware in Cordance v. in which two of the three asserted patents were found not infringed and the third invalid. Following Dave’s oral argument, the Federal Circuit affirmed the jury verdict. Dave has represented in numerous patent cases over the last 10 years, including the successful enforcement of’s 1-click® patent against

Dave served as trial counsel for Informatica, winning a $25 million jury award in its patent suit against Business Objects.

Dave represented Cryptography Research in asserting its eight fundamental differential power analysis countermeasure patents against Visa International, obtaining a successful settlement.

Dave was lead counsel for wireless messaging innovator Motorola Good Technology Group in multi-patent litigation with Visto. Prior to its acquisition by Motorola, Dave lead the defense of wireless messaging innovator Good Technology in its multi-front legal battles against Research in Motion (RIM), supplier of the BlackBerry service. That litigation encompassed five lawsuits in three jurisdictions and included patent, copyright, ​trademark, trade secret and business tort claims. Dave and his team defeated RIM’s motion for a preliminary injunction to prohibit the operation of Good’s GoodLink service on RIM handheld devices.