Doug advises technology and life sciences clients on mergers and acquisitions, strategic and commercial transactions, corporate counseling and governance, securities matters, shareholder activism and takeover defense. He co-chairs Fenwick’s M&A practice and served as a member of the firm’s executive committee for 10 years.

Doug's transactional experience spans over 25 years and includes over $175 billion of completed mergers, acquisitions and divestitures including cross-border transactions in the software, cybersecurity, internet, life sciences, medical devices, telecommunications, networking, semiconductor, computer hardware and consumer products industries.

Doug is ranked by Chambers Global as among the world’s leading lawyers for U.S. Corporate/M&A and is recognized as a Notable Practitioner for Corporate/M&A in the Nationwide–Highly Regarded listings. The publication, which includes client testimonials, recognized him as:

• "He is a fantastic lawyer and a true counselor to the business and legal team. He offers great insights." and "Doug Cogen is absolutely phenomenal! He is strategic, an awesome negotiator and clever. He thinks on his feet and is always looking out for clients' backs but aiming to get a deal done." (2021)

• "Incredibly smart and a consummate professional" and "he's tremendously strategic and knows how to leverage his experience" (2020)
  
• “Fantastic,” helps clients “understand the legal aspect of a matter without the jargon” (2019)
• “An excellent lawyer, partner and advisor, highly respected by company executives and board members” (2018)
• “Incredibly balanced” (2017)
• A “strategically brilliant practitioner who understands public M&A” (2016)
• Uses “innovative, outside-the-box solutions” (2014)
• “An incredible negotiator who sees the big picture” and “fair and easy to deal with” (2013)

Doug has served as director of Intergovernmental Relations for the New York City Planning Commission. He has also lectured on transactional law at Columbia University Law School, Stanford University Law School and the Stanford Graduate School of Business.​​​​​​​​​​​​​​