The environmental practice at Weil, Gotshal & Manges LLP offers expert assistance to corporate transactions within the firm. This enables the practice to handle a diverse range of corporate activities, including M&A deals, divestitures, financing, and restructuring. Additionally, the practice is well-regarded for its involvement in transactions that arise from bankruptcy. Spearheading the practice from Washington DC, Annemargaret Connolly is vastly experienced in the quantification of environmental and sustainability risks within transactions, receiving praise from clients as ‘one of the pioneers of the practice’. Matthew Morton is noted for his ’solid understanding of the intersection of environmental and business considerations’, which he lends to a diverse portfolio that includes clients from heavy industry, chemical manufacturing, and transport. John O’Loughlin assists private equity and corporate clients on environmental, health, and safety regulatory issues during transactions. The two practice out of DC. New York-based Seth Kerschner joined the practice from White & Case LLP in February 2025, with the group benefiting from his broad environmental practice and experience across the entire deal process.
Legal 500 Editorial commentary
Testimonials
Collated independently by Legal 500 research team.
‘They know as much as anyone in the space, and they bring excellent communication skills and a keen understanding of the commercial aspects of their work. They deliver practical and actionable advice to their clients.’
‘John O'Loughlin is who I have worked with most. He is a brilliant guy with an encyclopedic knowledge of the law and a very practical view of the world. He translates complex regulatory questions to simple, commercial advice, and he's just a pleasure to work with.’
‘They have a deep bench of very talented and experienced practitioners in the environmental transactions space. Annemargaret Connolly is one of the pioneers of the practice.’
‘Matthew Morton is excellent. Very solid understanding of the intersection of environmental and business considerations. Also very responsive.’
Key clients
- Advent International
- American Securities LLC
- Bell Canada (BCE Inc.)
- Brookfield Business Partners L.P.
- ChampionX Corporation
- Clarience Technologies, LLC
- Cobham Group Limited
- CPP Investments
- CVC Capital Partners
- DT Midstream
- Dycom Industries, Inc.
- Eli Lilly & Company
Work highlights
Advised Glencore PLC, Canada Pension Plan Investment Board and British Columbia Investment Management Corporation, as the shareholders of Viterra Ltd., a distributor of agriculture products offering grains, oilseeds, pulses, rice, sugar, and cotton, in its approximately $18 billion ($6.2 billion in stock, $2 billion in cash and $9.8 billion assumption of debt) business combination with Bunge Ltd.
Advised Sanofi in its $9.5 billion acquisition of Blueprint Medicines Corporation, a publicly traded biopharmaceutical company specializing in systemic mastocytosis.
Advised ChampionX Corporation in its sale to SLB, a provider of a wide range of products and services, including technology, project management and information solutions to the oil and gas exploration and production industry worldwide.
Lawyers
Hall of Fame
The lawyers at the very top of the profession, widely known and respected by peers and clients for their longstanding involvement in market-leading work.
Next Generation Partners
Junior partners with significant recognition from clients and peers in the market and key roles on multiple matters.
Practice head
Annemargaret Connolly
Other key lawyers
Matthew Morton; John O'Loughlin; Seth Kerschner