Jan-Baptist Lemaire
Associate - Attorney at Law
Jan-Baptist Lemaire, attorney at law, is an associate at the Brussels office focusing on energy and infrastructure projects and general public law.
Brussels
English, Dutch, French, German
Jan-Baptist joined Loyens & Loeff in 2025 and deals with matters related to general administrative law, public procurement, public-private partnerships (PPPs) and infrastructure projects. Jan-Baptist advises as well as represents clients in court.
Before coming to Loyens & Loeff, Jan-Baptist wrote a doctoral thesis on judicial review of governmental and company discretion, which allowed him to gain expertise in a wide ranges of topics, such as constitutional law, general administrative law, corporate law and contract law.
As part of his doctoral research, Jan-Baptist has published on various topics in administrative and contract law in national and international publications. He remains affiliated to KU Leuven as a voluntary research collaborator and as a substitute professor. He is also a member of the Sabin Center for Climate Litigation at Columbia Law School where he serves as a rapporteur for climate cases at the European Court of Justice. Jan-Baptist previously served as a submissions and lead editor at the Yale Journal on Regulation, the leading specialized journal in the United States on energy and environmental law, among other things. He was also a visiting researcher at Yale Law School and a member of the Yale Center of Environmental Law & Policy, as a research assistant for prof. Daniel Esty.
Work highlights
Contributions
Memberships
EU rapporteur, Sabin Center for Climate Change Litigation at Columbia Law School, 2022
Qualifications
LL.M., Yale University, United States, 2022
BA in philosophy, KU Leuven, Belgium, 2018
Research master's in law, KU Leuven, Belgium, 2016
Bachelor's in law, KU Leuven, Belgium, 2014
Publications
V. De Boe, J.-B. Lemaire, en R. Demoutiez, “Het FDI-screeningsmechanisme gescreend: twee jaar buitenlandse directe investeringsscreening in België”, in Het FDI-screeningsmechanisme gescreend: twee jaar buitenlandse directe investeringsscreening in België, Louvain-la-Neuve, Larcier-Intersentia, 2025, 301-338.
Bombay, A., Lemaire, J-B. (2024). Klimaatzaken: wie A(ansprakelijkheid) zegt, moet B(evel) zeggen? Inleidende beschouwingen bij het klimaatarrest over de scheiding der machten, toetsing via open normen, en het rechterlijk bevel. Tijdschrift voor Milieurecht, (1), 24-39.
Lemaire, J.-B. (2024) (2024). Het gezag van de rechter en rechtsvinding 2.0: rechterlijke motivering binnen de trias juridica. In M. E. Storme, & V. Sagaert (Eds.), Het beleid van de rechter 50 jaar later, (483-516). Mechelen: Kluwer.
Lemaire, J-B. (2023). Object, omvang en intensiteit van rechterlijke toetsing. België. In: S. Lierman, L. Wiggers-Rust (Eds.), Canon van publiek- en privaatrecht in dialoog. Een tweeluik vanuit Nederland en België, (99-105). (Platform voor publiek- en privaatrecht in dialoog). Zutphen: Uitgeverij Paris.
Lemaire, J-B. (2022). Het juiste reductiepad: toetsing van klimaatbeleid via redelijkheid of scheiding der machten? In: Privaatrecht 2050. De weg naar ecologische duurzaamheid, (237-266). Brugge: die Keure / la Charte.
Lemaire, J-B. (2020). ‘Blik naar het noorden’. Wat we kunnen leren van marginale toetsing in het Nederlandse recht. In: S. De Rey, N. Van Damme, T. Gladinez (Eds.), Grenzen voorbij. Liber discipulorum Bernard Tilleman, (489-521). Antwerpen: Intersentia.
Lemaire, J-B. (2022). Ontbinding van de overeenkomst en wezenlijke tekortkoming. In: Weens Koopverdrag, (984-1000). (Recht en Onderneming, 56). Brugge: die Keure/ la Charte.
We are pleased to invite you to our lunch & learn sessions “The proposal for an EU Public Procurement Act: Key changes and practical insights”, organised in Belgium, Luxembourg and The Netherlands.
Jan-Baptist Lemaire
Associate - Attorney at Law
Jan-Baptist.Lemaire@loyensloeff.com
Brussels
English, Dutch, French, German
<p>Jan-Baptist Lemaire, attorney at law, is an associate at the Brussels office focusing on energy and infrastructure projects and general public law.</p>
Jan-Baptist joined Loyens & Loeff in 2025 and deals with matters related to general administrative law, public procurement, public-private partnerships (PPPs) and infrastructure projects. Jan-Baptist advises as well as represents clients in court.
Before coming to Loyens & Loeff, Jan-Baptist wrote a doctoral thesis on judicial review of governmental and company discretion, which allowed him to gain expertise in a wide ranges of topics, such as constitutional law, general administrative law, corporate law and contract law.
As part of his doctoral research, Jan-Baptist has published on various topics in administrative and contract law in national and international publications. He remains affiliated to KU Leuven as a voluntary research collaborator and as a substitute professor. He is also a member of the Sabin Center for Climate Litigation at Columbia Law School where he serves as a rapporteur for climate cases at the European Court of Justice. Jan-Baptist previously served as a submissions and lead editor at the Yale Journal on Regulation, the leading specialized journal in the United States on energy and environmental law, among other things. He was also a visiting researcher at Yale Law School and a member of the Yale Center of Environmental Law & Policy, as a research assistant for prof. Daniel Esty.