Geoffrey West

Geoffrey West is a British theoretical physicist and former president of the Santa Fe Institute who, together with James Brown and Brian Enquist, developed the West-Brown-Enquist theory — the dominant theoretical explanation for biological scaling laws. The theory derives quarter-power scaling exponents from the geometry of hierarchical branching networks that distribute resources through three-dimensional space.

West's career trajectory is itself a study in interdisciplinary migration. Trained as a particle physicist, he moved into biology and then into urban science, applying the same network-physics framework to cities, corporations, and ecosystems. His work with Luis Bettencourt on urban scaling showed that cities obey power laws analogous to biological organisms — a finding that generated both enthusiasm and controversy.

The West-Brown-Enquist model has been criticized for idealized assumptions about biological networks, but West defends the theory as identifying a constraint on the design space of life — a boundary condition that evolution discovers rather than invents. His popular book Scale (2017) extended these arguments to a general audience, arguing that scaling laws reveal universal principles governing complex systems across domains.