Data Identity Politics and The Kimball vs. Inmon War

Reis reflects on the legendary Kimball vs. Inmon data warehouse wars, prompted by Bill Inmon’s recent Substack article. He attempted to arrange a podcast between Inmon and Kimball but Kimball declined — having moved on from the data industry entirely. The core war was between disciples, not the principals themselves, centered on ownership of the term “data warehouse” and which architecture was superior.

Key insight: the industry ultimately chose both. Modern lakehouse architectures use Inmon-style governance for raw/bronze layers and Kimball-style dimensional models for gold/serving layers. The synthesis won, not either individual approach.

Reis argues the “data identity politics” of picking sides no longer manifests the same way — the news cycle moves too fast, too many technologies compete for attention, and practitioners have moved past tribalism.

RDCO relevance

Directly relevant to dbt consulting work where clients frequently ask “Kimball or Inmon?” The answer — pragmatic synthesis — aligns with how we position data modeling engagements. The anti-tribalism stance mirrors the mixed-model-arts philosophy Reis develops throughout the book series.