Hendrik Maas, director of the National Institute for Public Wellbeing (NIPW), announced his resignation on Tuesday 22 September 2026 after confirming he had approved an accelerated pilot giving the private firm CascadeMind access to large volumes of Dutch patient data. Maas said he stepped down "to avoid further damage to public trust" and that the contract would be halted pending review.
The agreement — signed in principle in June and activated last month — had allowed CascadeMind to train algorithms on 3.4 million patient records drawn from several hospital systems, including diagnostic notes and free‑text mental health entries. Hospitals and unions said they were not consulted and dozens of patient‑advocacy groups described the move as a breach of consent and privacy.
Maas told reporters in the abrupt midday press appearance that he had fast‑tracked the deal to attract investment and stop a rival firm from cornering the Dutch market for diagnostic algorithms. "I believed speed would secure benefits for patients and for our hospitals," he said. "That assessment was wrong. I accept responsibility." Matěj Šplíchal, a machine‑learning researcher at the University of Amsterdam, said the process showed poor judgement: "You do not hand over free‑text notes without ironclad controls. Re‑identification is not theoretical here."
They treated patients' notes like an asset to be sold at a discount. It's unforgivable.
Steven Sangalimuthu, lead organiser, Dutch Nurses' Federation
The deal and the data
Internal briefings seen by hospital boards described the dataset as "pseudonymised" but including narrative clinical notes, dates of birth and local hospital IDs — a combination that experts say increases the risk of patients being re‑identified. Noelia Urías‑Roque, who runs a patient rights charity in Rotterdam, said she had been told consent would not be re‑sought: "Patients were told the system would help diagnosis; nobody was told their private therapy notes could be used to teach an overseas algorithm." A complaint has already been prepared for the Dutch Data Protection Authority.
Hospitals freeze pilots
Within hours of Maas's resignation, three hospital trusts announced they were suspending all AI pilots and revoking data access keys. Candida Bechtelar, an ICU nurse at one of the affected trusts, said staff felt betrayed: "We were promised tools to help triage; instead our patients' confidential conversations are now entangled in a corporate project we didn't sign off on." The Dutch Nurses' Federation said it would consult members on industrial action if ministers did not force a full public audit.
The minister of health, Anouk van der Meer, summoned Maas to explain the decision on Monday and has called a parliamentary committee hearing for Friday 25 September. Van der Meer said she had ordered an immediate suspension of the CascadeMind contract and a separate forensic review of data transfers. Opposition parties demanded the minister produce the contract and threatened a censure motion if the government could not show a clear legal basis for the transfers.
CascadeMind, which is registered in the Longhai Republic and operates a development arm in the Atlantic Union, issued a short statement saying it would cooperate with Dutch authorities and freeze all use of Dutch health data "pending an independent review". Matěj Šplíchal warned that the firm's partner agreements — which included clauses allowing cross‑border research — raised questions about whether EU privacy rules had been fully observed.
Financial and legal fallout mounted on Tuesday. Lawyers for several patient groups said they would file collective complaints under EU data protection rules, which can attract fines up to 4% of a firm's global turnover. Hospital administrators said research grants linked to the CascadeMind partnership worth about €12 million (about $13 million) had already been paused. Paula Perković, a hospital board member in The Hague, said the resignation would not restore trust: "Staff need guarantees and patients need answers — not gestures."
Ministers, unions and hospital managers now face a week of intense scrutiny. The parliamentary hearing on Friday and the promise of legal action from patient groups increase the chance that the NIPW's decision‑making processes will be overhauled — and that rapid AI pilots across Dutch health services will be put on hold until new safeguards are written into law.
