Mr Olivier van der Haegen > Loyens & Loeff > Brussels, Belgium > Lawyer Profile

Loyens & Loeff

Work Department

Olivier is Counsel in the Loyens & Loeff Litigation & Risk Management Practice Group in Belgium.


Olivier is experienced in international commercial litigation and arbitration. He has acted as counsel in various arbitration proceedings, either ad hoc or under institutional rules (mostly ICC and Cepani). He also handles litigations before Belgian courts in the construction, energy, financial and food industries. His recent activities include the representation of a food company in a post-M&A Cepani arbitration under Belgian law, a mining company acting as claimant in two ICC arbitrations under Congolese law and an African company in an ICC emergency arbitration. Olivier has also developed particular expertise in court proceedings relating to setting aside, recognition and/or enforcement of arbitral awards or foreign judgments. Olivier has been named “next generation lawyer” in Dispute Resolution by Legal 500 and a “Future Leader” in international arbitration by Who’s Who Legal (category “non-partner”).


Olivier started his career at the Brussels Bar in 2010. Prior to joining Loyens & Loeff, Olivier has worked as (senior) associate in two other law firms in Brussels.

He is mentionned as “Next Generation Partner” in the Dispute Resolution field in the Legal500 (2020 edition) and also as “Future Leader” in the Arbitration field in the Who’s Who Legal (2020 edition).


Laurent works in French, English and Dutch.


He is a member of Cepani (the Belgian arbitration institution) and Cepani 40 Steering Committee.


Olivier holds LL.M. degrees from the University of Chicago (2010) and the College of Europe (Bruges; 2009), and a Master’s degree in Law from the Université Catholique de Louvain (2008, summa cum laude).

Lawyer Rankings

Belgium > Insolvency and restructuring

The insolvency and restructuring department at Loyens & Loeff specialises in financial reorganisations, with a cross-practice set-up drawing on the firm’s aviation, employment and real estate know-how. Well versed in transactional work and litigation relating to companies experiencing financial distress, the team has regularly been instructed following the introduction of the Belgian government’s Covid-19 response measures. Led by new hire Vanessa Marquette, who joined the firm from Simont Braun in March 2020, the team also includes Marc Vermylen, newly promoted disputes partner Olivier van der Haegen and of counsel Laurent Mertens, who are praised for their ‘professionalism, flexibility and know-how‘.

Belgium > Dispute resolution

At Loyens & Loeff, the ‘very professional and motivated‘ team represented the Kingdom of Spain in proceedings pertaining to damages claims brought against Spanish judge Pablo Llarena by former members of the Catalan Government for alleged defamation; the court has declared itself without jurisdiction on the grounds of the Kingdom of Spain’s immunity, which also covers Llarena. Hakim Boularbah and Olivier van der Haegen jointly head up the department.