Recognised as a leading authority in the sector, Jan-Willem provides strategic guidance to clients navigating complex transactions and transformative energy & infrastructure projects. His expertise spans the full spectrum of energy and infrastructure, with a particular focus on energy transition initiatives, where he advises on both corporate acquisitions and project-level structuring.

Clients value Jan-Willem’s ability to anticipate market shifts and deliver solutions that align with their long-term objectives. His leadership ensures seamless execution of high-stakes deals and complex matters. Ranked as a leading individual by world renowned professionals guides such as Legal 500 and Chambers & Partners, Jan-Willem is praised for his exceptional insight and deal-making acumen: “He really understood what we wanted to achieve and drove the deal forward.”

Sectors & Markets

Work highlights

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Memberships

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International Bar Association (member European Forum), 2010
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American Bar Association (subcommittee co-chair), 2010
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Association of International Petroleum Negotiators (chair of the Dutch chapter), 2010
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Dutch Bar Association, 2000
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Qualifications

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Columbia University Program in American Law, 2002
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Dutch civil law, Erasmus University Rotterdam, 1999

What others say

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Jan-Willem Van Rooij regularly acts for multinational companies on transactions and energy projects. He is well placed to advise shareholders on contract negotiations, with further experience in assisting clients working with wind, hydrogen and battery storage-related projects and transactions.
Chambers & Partners - Europe (2025)
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"Jan-Willem Van Rooij is one of the reasons we selected Loyens & Loeff."
Chambers & Partners - Europe (2025)
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"Jan-Willem Van Rooij is a top-tier senior practitioner that provides strong guidance and oversight to the team he leads."
Chambers & Partners - Europe (2024)
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"He was exceptional - he really understood what we wanted to achieve, really drove the deal."
Chambers & Partners - Europe (2024)
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Jan-Willem Van Rooij is ranked Band 2 for Energy & Natural Resources: Transactional
Chambers & Partners - Europe (2024)
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"Jan Willem van Rooij and team stand-out for their knowledge of the market and business."
Legal 500 - EMEA (2024)
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"You know you have Jan Willem van Rooij fully on your side and it feels like his is part of your team and company. He is fully dedicated and has great drive to help one win. He knows his business and the rules of the game and uses his personal competencies to always search for ways to get the best deals."
Legal 500 - EMEA (2024)
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"Jan Willem is very pleasant to engage and work with."
Legal 500 - EMEA (2024)
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Jan-Willem van Rooij named "Practice head" in Energy
Legal 500 - EMEA (2024)
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"He comes in at the right time with a steady hand."
Chambers & Partners - Europe (2023)
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"He is one of the most pragmatic lawyers I have worked with and has a really commercial mindset."
Chambers & Partners - Europe (2023)
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Jan-Willem van Rooij is Band 2 ranked for Energy & Natural Resources: Transactional
Chambers & Partners - Europe (2023)
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Jan-Willem van Rooij named "Practice head" in Energy: Regulatory
Legal 500 - EMEA (2023)
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Jan-Willem van Rooij named "Practice head" in Energy: Transactional
Legal 500 - EMEA (2023)
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Jan-Willem van Rooij is recognised as Recommended in Energy - Oil & Gas
Who's Who Legal - (2023)
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Jan-Willem van Rooij is recognised as Recommended in Energy - Power/Electricity
Who's Who Legal - (2023)
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Jan-Willem van Rooij is recognised as Recommended in Energy - Renewables
Who's Who Legal - (2023)
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"A strong position in the oil and gas sector."
Chambers & Partners - Europe (2022)
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‘L&L had a three people core team on this transaction and brought in the necessary experts whenever we needed them. Jan-Willem van Rooij as partner of the firm was always involved personally and was totally aware of details. And found solutions for complex issues.’
Legal 500 - EMEA (2022)
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‘Jan-Willem van Rooij is balanced, a good listener, knowledgeable, sharp and engaged.‘
Legal 500 - EMEA (2022)
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‘Jan-Willem van Rooij is great at team leading and has excellent commercial awareness and client management skills.‘
Legal 500 - EMEA (2022)
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Jan-Willem van Rooij is Band 2 ranked for Energy & Natural Resources: Transactional
Chambers & Partners - Europe (2022)
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Jan-Willem Van Rooij acts for multinational oil and natural gas companies on transactions and energy projects. He is praised by clients for his attentiveness, one calling him "dedicated, available and knowledgeable."
Chambers & Partners - Europe (2021)
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Jan-Willem Van Rooij is regarded by an interviewee as "very sharp, good in negotiations and to the point," whilst another interviewee singles out his communication skills: "He's always friendly and honest, has good judgement and goes the extra mile as required." He handles a range of commercial matters, including joint ventures, investments and share transactions.
Chambers & Partners - Europe (2020)
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"Jan-Willem Van Rooij is described by interviewees as an 'exceptional deal coordinator and adviser'."
Chambers & Partners - Europe (2019)
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"The ‘calm, hands-on’ Jan-Willem van Rooij heads Loyens & Loeff’s ‘top-notch’ department."
Legal 500 - EMEA (2018)
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"Jan-Willem van Rooij, who ‘always remains composed and bridges differences between opposing parties’, advised DIF on the sale of DIF Infrastructure II’s assets to APG Asset Management."
Legal 500 - EMEA (2018)
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Jan-Willem van Rooij

Partner - Attorney at Law

jan.willem.van.rooij@loyensloeff.com

Rotterdam, Amsterdam

Dutch, English

Person image

<p>Jan-Willem van Rooij is a senior partner and chair of the Energy & Infrastructure expertise firmwide, bringing over 25 years of excellence in M&A matters and project development within the energy & infrastructure sector. <br></p>

Recognised as a leading authority in the sector, Jan-Willem provides strategic guidance to clients navigating complex transactions and transformative energy & infrastructure projects. His expertise spans the full spectrum of energy and infrastructure, with a particular focus on energy transition initiatives, where he advises on both corporate acquisitions and project-level structuring.

Clients value Jan-Willem’s ability to anticipate market shifts and deliver solutions that align with their long-term objectives. His leadership ensures seamless execution of high-stakes deals and complex matters. Ranked as a leading individual by world renowned professionals guides such as Legal 500 and Chambers & Partners, Jan-Willem is praised for his exceptional insight and deal-making acumen: “He really understood what we wanted to achieve and drove the deal forward.”