
Environment: Mainly Transactional
USA Guide 2026 : District of Columbia
Rankings

Ranked Individuals
Ranked Individuals
Chambers Review
Provided by Chambers
Work Highlights
Provided by Chambers
Weil advised Sanofi on its acquisition of Blueprint Medicines for an equity value of USD9.5 billion.
Strengths
Provided by Chambers
Weil is a very commercial team, its attorneys know their stuff, they're good at focusing on major issues and not wasting time scoring points or trying to do things for the sake of it.
Environment: Mainly Transactional respondentUSAWeil is always reliable as an experienced and deeply knowledgeable voice in any assessment. It is consistently commercial, efficient and oriented to practical solutions.
Environment: Mainly Transactional respondentUSAThey cover all the basis and have a very deep bench. They are very creative people when it comes to problem solving. They are my go-to firm for anything complicated or unusual.
Environment: Mainly Transactional respondentUSAThe team is very client focused. It anticipates client questions and needs and effectively communicates those to others on the deal team.
Environment: Mainly Transactional respondentUSA
Notable Practitioners
Provided by Chambers
Band 2 
Band 2 
Matthew Morton
Matthew Morton offers experienced due diligence and contracting counsel to clients engaged in corporate transactions. Matthew is a seasoned environmental attorney that has substantial M&A experience involving most types of industries.
Environment: Mainly Transactional respondentUSA
Band 3 
Band 3 
John O'Loughlin
John O'Loughlin acts for financial institutions, private equity firms and corporate clients on a range of proceedings. His expertise includes handling complex environmental issues that arise in transactions involving pharmaceutical and healthcare companies. John is simply an excellent attorney across the board and a pleasure to work with. I genuinely enjoy solving problems with him; he is practical, deeply smart and an excellent communicator.
Environment: Mainly Transactional respondentUSA
Ranked Individuals at Weil, Gotshal & Manges LLP (2)
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