tri Valley Law, PLLC

About us

Who we are

Marc Greendorfer is the founding partner of Tri Valley Law.  Prior to founding Tri Valley Law, Marc was Special Counsel in the business and finance department of the international law firm Thelen LLP, joining Thelen in New York City and continuing with Thelen's San Francisco office.  Marc has also practiced business law at Howard Rice Nemerovski Canady Falk & Rabkin in San Francisco and Olshan Grundman Frome Rosenzweig & Wolosky, LLP in New York City.

​Marc has represented public and private business entities in various corporate transactions, including entity formation, mergers and acquisitions, public offerings, private placements, venture capital and private equity financing, proxy contests, and tender offers.Marc has counseled clients and their officers and directors on day-to-day corporate matters, including corporate governance, shareholder issues, securities regulation and compliance and commercial and regularly represents clients in negotiating a variety of intellectual property and consulting agreements.


In addition to his business law experience, Marc has been active in constitutional law advocacy, writing and publishing a number of papers and participating in Supreme Court cases as amicus curiae, where arguments and language from his briefs have been used by Justices in the Hobby Lobby and same sex marriage case opinions. Marc's advocacy work on the legality of foreign boycotts has been cited and incorporated in the work of many rights organizations and his paper on the so-called "BDS Movement" was cited by the Supreme Court of Israel in its recent decision to uphold Israel's domestic anti-boycott law.  Marc's advocacy work is carried out through a separate legal foundation, the Zachor Legal Institute. 



J.D., magna cum laude (top 5% of class), Benjamin N. Cardozo School of Law, 1996.  Articles Editor-Submissions, Cardozo Law Review.


B.A., Economics and Psychology, University of California, Davis, 1986. 


​Bar Admissions and Affiliations


Admitted to practice in Montana, California and New York


Member, The Federalist Society


Admitted to practice before the United States Supreme Court, the United States District Courts for the Montana and the Northern District of California and the United States Courts of Appeals for the Fourth, Fifth, Sixth, Ninth, Tenth and Eleventh Circuits.


​Prior Affiliations


Thelen LLP 

Howard Rice Nemerovski Canady Falk & Rabkin, PC

Olshan Grundman Frome Rosenzweig & Wolosky, LLP

Mudge Rose Guthrie Alexander & Ferdon LLP