# Arnold Magcale

> Arnold Magcale is the founder and CEO of Ultrascale Digital Infrastructure and the founder and original CEO of Nautilus Data Technologies, where he later served as CTO and chief scientist. His career spans Navy service, early internet and mobile-service infrastructure, waterborne data centers and liquid-cooling systems.

- **Role:** Founder and CEO at Ultrascale Digital Infrastructure
- **Organizations:** Ultrascale Digital Infrastructure, Nautilus Data Technologies, Exodus Communications, Loudcloud, Danger, Inc., Microsoft, Motorola Mobility, United States Navy
- **Education:** Bachelor of Science in Information Systems, University of Massachusetts Lowell, Massachusetts Institute of Technology - Sloan School of Management
- **Known for:** Founded Nautilus Data Technologies and helped develop its waterborne data-center concept., Led Nautilus as CEO before continuing as CTO in March 2016., Founded and leads Ultrascale Digital Infrastructure.

## Career timeline

- **Before technology career** — Served for ten years in the U.S. Navy Special Forces, according to his biography.
- **1999** — Joined Exodus Communications, according to his personal biography.
- **2001** — Joined Danger and worked on service infrastructure for the Hiptop/Sidekick.
- **2008** — Danger was acquired by Microsoft.
- **2013** — Founded Nautilus Data Technologies and served as its original CEO.
- **2014-2015** — Nautilus developed and tested its waterborne data-center prototype.
- **2016-03** — Continued as CTO after James L. Connaughton succeeded him as CEO.
- **2021-04** — Nautilus commissioned the Stockton data center.
- **2022-07** — Published an essay arguing for resource measurement beyond PUE; identified as Nautilus founder and chief scientist.
- **2023-11** — Identified as Ultrascale founder and CEO in its partnership announcement with Lonestar.
- **2024** — Ultrascale announced partnerships with Cargill and Caddis Cloud Solutions.
- **2025-07** — Named inventor on granted patent US12363872B2, Systems and methods for cooling server modules.

## Achievements

- Founded Nautilus Data Technologies and helped develop its waterborne data-center concept.
- Led Nautilus as CEO before continuing as CTO in March 2016.
- Founded and leads Ultrascale Digital Infrastructure.
- Named inventor on multiple data-center cooling and infrastructure patents.

## Latest updates

- **2025-07** — Patent US12363872B2 was granted on July 15, naming Arnold Castillo Magcale as inventor and Nautilus TRUE, LLC as assignee.
- **2025-03** — Rack-cooling application US20250081407A1 was published on March 6, naming Arnold Castillo Magcale as inventor.
- **2024-11** — Ultrascale listed him in an SC24 discussion with Gary Tinkler and Shawn Novak.
- **2024-08** — Ultrascale announced a strategic alliance with Caddis Cloud Solutions.
- **2024-07** — Ultrascale’s partnership with Cargill around NatureCool 2000 immersion fluid was publicly reported.

## Links

- Website: https://about.me/ArnoldMagcale
- LinkedIn: https://www.linkedin.com/in/arnoldmagcale
- Twitter/X: https://www.twitter.com/ArnoldMagcale

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Profile page: https://yespress.io/arnold-magcale
Published by YesPress — https://yespress.io
Last updated: 2026-10-22