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Duncan J. Watts studies graphs and collective behavior using mathematical models, experiments, and large-scale data. His 1998 work with Steven H. Strogatz introduced the Watts-Strogatz model, showing how a few rewired connections can greatly shorten paths in an otherwise locally clustered graph.^[ref]

This gave a concrete explanation for how high clustering and short path lengths can coexist. His institutional biography describes research on social and organizational graphs, collective dynamics, and web-based experiments, alongside training in physics and theoretical and applied mechanics.^[ref]

By Steven H. Strogatz. Physica D 143, pages 1–20.

Steven H. Strogatz is an applied mathematician studying nonlinear dynamical systems. His research includes synchronization of oscillators: how interacting periodic units can develop coordinated rhythms, as in flashing fireflies or biological oscillations.^[ref] With Duncan J. Watts, he studied small-world networks, connecting strong local clustering with short paths across a network.^[ref]