The research McKinsey used to sell corporate boards on diversity is now the subject of a federal document demand, and the target is not any single employer’s DEI program but the data that justified building one in the first place.
Rep. Brandon Gill (R-Texas), chairman of the House Oversight Committee’s Task Force on Defending Constitutional Rights and Exposing Institutional Abuses, sent a letter on August 17 to McKinsey Global Managing Partner Robert Sternfels demanding all documents and communications behind four McKinsey reports: Why Diversity Matters (2015), Delivering Through Diversity (2018), Diversity Wins (2020), and Diversity Matters Even More (2023). Gill’s letter alleges the reports rely on unverified data to argue that race- and gender-diverse leadership improves financial performance, and that the resulting hiring guidance amounts to a Title VII violation. He requested the underlying datasets, documentation of any exclusions, and internal records tied to how the reports were built and reviewed.
For HR teams, the significance is not the McKinsey brand, it is the methodology. Those four reports are among the most-cited sources any consulting firm, board deck, or DEI vendor pitch has used since 2015 to argue that diverse hiring is a performance lever rather than a compliance obligation. A federal task force treating that dataset as potentially unreliable, or as evidence supporting discriminatory hiring, puts every program built on top of it, not just McKinsey’s own advisory work, one step closer to legal exposure.
The original insight here is what this probe targets that other 2026 DEI enforcement has not. HRTech has already tracked the Justice Department’s use of the False Claims Act against Deloitte’s DEI programs and shareholder pressure to preserve EEO-1 workforce data. Both actions go after how individual employers run diversity programs. Gill’s letter goes after the research infrastructure that told employers those programs would pay off in the first place, which means its outcome could reshape how every consulting firm, not just McKinsey, is willing to publish diversity-linked performance claims going forward.
