Outcomes over output
We commit to a business metric, not a number of deliverables.
About us
We exist to close the gap between AI promise and AI practice.
H4 was founded by people who'd spent years shipping machine learning inside large companies, and watched too many AI initiatives die in slideware.
Our story
Built by practitioners, for practitioners
We started H4 in 2021 with a simple belief: AI projects fail for business reasons far more often than technical ones. Unclear goals, missing data, no owner, no plan for adoption.
So we built a consultancy that sits across all of it. Strategists who understand P&Ls, engineers who've run models at scale, and change specialists who make sure people actually use what we build.
Today we're a team of 40 across London, Amsterdam and New York, and we've helped more than 120 organisations take AI from idea to impact.
Our principles
What guides every engagement
Radical independence
No vendor partnerships or referral fees. Ever.
Responsible by default
Safety, privacy and fairness are design inputs, not afterthoughts.
Leave them stronger
Success means your team doesn't need us to keep going.
Leadership
The people you'll work with
Senior practitioners lead every engagement. No bait-and-switch.
EA
Elena Alvarez
Co-founder & CEO. Ex-Head of ML at a global retailer.
DO
David Okafor
Co-founder & CTO. Built LLM platforms serving 10M users.
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Sofia Nakamura
Partner, Strategy. Former management consultant.
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Tom Becker
Partner, Governance. AI policy and risk specialist.
Milestones
Five years of shipping
2021
Founded in London
Three founders, one client, and a mission to make AI work in the real world.
2023
Generative AI practice launched
Shipped our first production LLM applications across insurance and SaaS.
2024
Amsterdam office opens
Expanded our governance practice ahead of the EU AI Act.
2025
New York and 100 clients
Crossed 100 clients and launched our agents & automation practice.
2026
85+ systems in production
And a team of 40 practitioners across three cities.
Start with a 30-minute call
Less hype. More shipped AI.
Tell us where AI could move the needle in your business. We'll tell you honestly whether it can, and what it would take.
NDA on request. Your data never trains third-party models.