Jacomijn (Jackie) van Haersolte-van Hof is an independent arbitrator and a professor of law at Leiden University. From 2014-2024 she was the Director General of the London Court of International Arbitration.

Jacomijn has served as arbitrator and counsel in dozens of disputes in arbitrations administered by the following institutions and/or governed by the following rules:

• International Chamber of Commerce
• London Court of International Arbitration
• ICSID
• UNCITRAL
• Netherlands Arbitration Institute
• Royal Dutch Grain and Feed Trade Association
• Various ad hoc proceedings
• Member of UNUM (the Dutch Transport Arbitration Institution)
• She was recently added to the Panel of Arbitrators of the Singapore International Arbitration Centre (SIAC).

She has advised and represented multinational companies in commercial, investment, and dispute matters; acting for and against foreign states. Matters include sales and general contract law, post-Merger & Acquisition disputes; energy law (including gas price review disputes); international law (investment law; immunity law); transport and commodities, shipbuilding, including off-shore; insurance. Assisting parties in meditation.

Previously, from 2008 until she joined the LCIA, she practiced as counsel and arbitrator at her GAR100 boutique in The Hague, HaersolteHof. Before then, she worked with the Rotterdam law firm Loeff Claeys Verbeke (1992-2000), including in its corporate and maritime law departments. During that time, she was seconded to the Claims Resolution Tribunal for Dormant Accounts in Zürich. Subsequently, she joined De Brauw Blackstone Westbroek in The Hague (2000-2005), and thereafter Freshfields Bruckhaus Deringer in Amsterdam as counsel in the International Arbitration Group (2005-2008).

She was a summer associate with Baker McKenzie, New York (September-October 1988); intern with Chalos, English & Brown, New York (January-June 1987); Fisher Porter & Kent in Long Beach, California (October-December 1986); and Van Doorne & Sjollema Rotterdam (March 1986). From 1987-1991 she was Assistent in Opleiding Rijksuniversiteit Leiden.

In 2020, she gave the 35th Annual Freshfields Arbitration Lecture. She is a member of the Editorial Board of Global Arbitration Review, member of the Advisory Council Pledge on Equal Representation in Arbitration, and member Arbitration Committee International Law Association. From 2008 until 2018 she was a Lecturer in International Arbitration at the Vrije Universiteit Amsterdam. She acted as a member of the committee advising the European Commission on the amendment of the Brussels Regulation. She was a member of the Board of the Netherlands Arbitration Institute. She taught arbitration to in-house lawyers and law firm trainees. She recently gave evidence to the House of Lords in relation to the reform of the 1996 English Arbitration Act.

As of 1 July 2026, she is a member of the Challenge Committee of the Netherlands Arbitration Institute.