The four-year-long dispute over Hadid's estate, which began after her death in 2016, was settled in a court hearing held remotely on a video call due to the coronavirus pandemic.
The four executors of Hadid's estate – Schumacher, Zaha Hadid's niece Rana Hadid, developer Peter Palumbo and artist Brian Clarke – agreed that the majority of Zaha Hadid's assets will go to the Zaha Hadid Foundation.
However, Schumacher lost his right to have a veto on decisions made by an employee benefit trust that will be created to oversee the studio, which trades as Zaha Hadid Limited.
Executors disagreement a "toxic dispute"
Schumacher brought the case against the other three executors of Hadid's estate, who along with Schumacher are all directors of Zaha Hadid Holdings, as he wanted independent executors appointed.
The trio had accused Schumacher of attempting to remove them as co-executors, but the Zaha Hadid Architects principal said he was only attempting to move the negotiations along.
An estimated £100 million of Hadid's assets – including paintings, sketches, architectural models and properties in Miami and London – has already been catalogued.
Monetary value from shares in the late British-Iraqi architect's companies, including Zaha Hadid Design, has been transferred to the Zaha Hadid Foundation. This charity plans to set up a museum and offer scholarship funds benefitting the architectural education of Arab women.
Accusations of sexual misconduct
The court case revealed the depth of acrimony developing between Schumacher and the other three friends and relatives appointed by Hadid to manage her estate.
Two independent legal reports were presented by the defendants in their attempt to block Schumacher's veto ahead of the hearing this month, the Guardian reported.
One report from 2019 alleged "numerous failings of corporate governance" by Schumacher, including an alleged history of abusing the power of veto – including vetoing the fees incurred by the investigation.
A second report from 2020 alleged that Schumacher had inappropriate sexual and romantic relationships with junior staff members and pursued pay rises and promotions for those he had romantic relationships with.
Practice "dismayed" by allegations
Marsh said his decision to rule against Schumacher was not influenced by these reports, which the judge described as full of "highly contentious evidence".
In a later statement, Zaha Hadid Architects said the practice "is dismayed by the unfounded allegations".
"The allegations are unproven, contested, and must be considered in the context of a long-running, acrimonious dispute between the trustees of Zaha's estate," added the practice.