Meridian · Defense Technology for Global Risk

Same tools
as modern defense.
Built to protect.

Advanced technology for the institutions whose mandate is keeping populations safe — from pandemics, information collapse, country-level instability, and the misallocation of capital that fuels global risk.

What Meridian Is  → See the Products
04
Active Products
217
Countries Modeled
2,300+
Sources Monitored
5
AI Systems in Pipeline

Same architectural seriousness as Palantir, Anduril, and modern defense tech. Different threat surface. Different theory of who the customer is.

Four products.
Four threat surfaces.

Each product targets one of the most consequential and underserved problem domains in global risk. Each is shipping or in active development. Each was built with the same engineering discipline applied to modern defense, oriented toward institutions whose mission is protection.

v0.8 · Shipping
Cronkite
Named for Walter Cronkite
A consensus engine for information integrity.
Five frontier AI systems — Claude, GPT, Gemini, Grok, Mistral — independently evaluate web content. Agreement is the verdict. Disagreement is the verdict. The first epistemic-grading platform built for the era of generative AI.
Read the product page →
Live · Beta
Snow
Named for John Snow
Early warning for the threats militaries don’t train for.
Continuous AI surveillance of 2,300+ global news, scientific, and government feeds. Detects emerging outbreaks, CBRN incidents, and humanitarian crises in their earliest signal — days or weeks before institutional response begins.
Read the product page →
MVP · Live
Marshall
Named for George Marshall
A continuous risk score for every country in the world.
217 countries scored across five risk domains — societal, economic, geopolitical, technological, environmental. Continuously updated as conditions change. The country-risk index built for the institutions that need to act on it, not just read about it.
Read the product page →
Phase 0 · Methodology Live
Pecora
Named for Ferdinand Pecora
Mapping capital to consequence.
An ethical investing intelligence platform that maps publicly traded companies to whether they mitigate or exacerbate global risks — with the financial returns to back the methodology. Ground Truth Capital is the live proof of concept.
Read the product page →
Built For

Institutions whose mandate
is protection.

01 · Humanitarian
UN agencies, ICRC, MSF, WFP
For whom early warning, country risk assessment, and information integrity are operational requirements — not analytical luxuries.
02 · Public Health & Multilateral
WHO, CDC, ministries of health
For whom outbreak surveillance, biosurveillance integration, and country-level health-system risk are core institutional functions.
03 · Defensive Defense & Intelligence
Force health protection · humanitarian operations · civil-military coordination
The components of national security whose mission is genuinely defensive — protection, not projection.

The institutions that protect human populations are doing their work with last generation’s tools. Meridian exists to change that.

Read the case for Meridian  → Latest Writing

Meridian is the independent research and applied-technology project of Mark Greenhalgh. Views, analysis, and materials published under the Meridian name are his own and do not represent the position of the U.S. Department of Defense, the Department of the Army, or any U.S. government agency or component. Meridian operates independently of his official duties.