Dan Caruso

Dan Caruso

Founding CEO of Zayo Group and a co-founding executive of Level 3 Communications. About the author

  1. Bandwidth

    The Untold Story of Ambition, Deception, and Innovation That Shaped the Internet Age and Dot-Com Boom

    Published February 4, 2025, by Amplify Publishing

    The characters and epic journey of the creation of the Internet backbones, the building of the early competitive fiber networks in the 1990s, the Bandwidth Boom and Bust, and Resurrection, ending in 2020 when Zayo was sold.

    “A rigorous history as told by one who helped make it.”

    Kirkus Reviews

    Read Bandwidth onlineAbout the book

  2. Gigawatts

    The untold story of ambition, real estate and raw power, from the mainframe to the AI gold rush

    First draft, November 2026. Published online and still being revised.

    A history of the data center, from 1960s time-sharing through the dot-com hosting boom and bust, Equinix and the cloud, to today’s AI build-out. A collaboration between Claude and Dan Caruso, author of Bandwidth.

    Read the first draft of GigawattsAbout the book

  3. Spectrum

    In progress. Its site is being set up.