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 >

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
13th 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

Effie Toshav

Partner, Corporate  

Seattle | San Francisco 206.389.4576


Effie Toshav’s national practice focuses on providing counsel to life sciences clients where she serves as a strategic advisor on a wide range of business and legal issues. Her experience covers the full spectrum of issues and transactions facing such companies and investors, including formation issues, public offerings, spin outs, corporate financings, mergers and acquisitions transactions and general corporate governance. Effie also advises her clients on the negotiation and structuring of complex technology transactions, complex strategic partnering transactions, intellectual property counseling, R&D commercialization collaborations and university licensing.

Effie is known for partnering with her clients as an integral member of the management team to collaborate on setting strategic direction as well as structuring and negotiating complex legal and corporate transactions. Her extensive operational in-house experience and deep understanding of the issues facing emerging and public life science companies allows her to provide clients with highly practical and relevant advice.

Prior to joining Fenwick & West, Effie served as Senior Vice President and General Counsel with Sarepta Therapeutics, Inc. (NASDAQ: SRPT), a developer of RNA-based therapeutics, and prior to that, a partner in the life sciences practice at Wilson Sonsini Goodrich & Rosati. From June 2004 to June 2006, she was general counsel of GlycoFi, a venture-backed, private biotechnology company, and played a significant role in the sale of the company to Merck for $400 Million. Prior to GlycoFi, Effie was senior corporate counsel at Protein Design Labs, predecessor of Facet Biotech.