Before there was a single interface to deliver, a small group of people decided a hospital’s data should belong to no one company. Everything HL7 Interfacing has built — 200+ interfaces across 20+ states — stands on what they chose to give away.
Read the lineage
HL7 was never just a message format. It was healthcare’s agreement to keep systems speaking when care depended on it.
29–31 March 1987 · Philadelphia
The storm that started a standard
At the Hospital of the University of Pennsylvania, during what Ed Hammond later called the worst electrical storm he’d ever seen, a group of hospital CIOs, vendors, and engineers gathered with one goal: build a standard simple enough to implement immediately.
The catalyst was real pain. Sam Schultz, HUP’s chief information officer, had learned the hard way that connecting clinical systems got more expensive and more brittle by the day. Every interface was bespoke. Nothing was repeatable.
Sam Schultz · HUP CIOEd Hammond · DukeClem McDonaldWes Rishel
The decision · 1985–1987
Don Simborg gave the protocol away
The seed was the StatLAN protocol, born at UC San Francisco and commercialized by Simborg Systems. It would have been easy to keep it proprietary — a competitive moat.
Instead, Donald W. Simborg put StatLAN into the public domain and pushed to create a neutral standards body to carry it forward. That act of generosity — choosing the commons over the moat — is the reason the rest of this story is possible.
In 1989, when critics worried HL7 was too close to his own company, Simborg stepped down as chair. He let the standard outgrow him.
He gave away the one thing he could have owned. So the whole field could move.
Donald W. Simborg · founderStatLAN · UCSF
1988–1994
The standard hardens into infrastructure
HL7 v2 arrived in 1988 — pipe-delimited, fast, immediately useful. ADT, orders, results. For the first time, an interface could be repeatable instead of reinvented.
Ed Hammond took the chair and professionalized the community: formal balloting, governance, and finally ANSI accreditation in 1994. A volunteer idea became national infrastructure.
HL7 v2 · 1988ADT · ORM · ORUANSI · 1994
July 2011 · Melbourne
Grahame Grieve writes FHIR after hours
Two decades on, the web had moved and healthcare hadn’t. Grahame Grieve — an HL7 veteran later called “the father of FHIR” — began writing “Resources for Health” outside the hours of his day job, after a family health emergency showed him how fragmented care really was.
His insight: stop sending rigid messages, start exposing small modular resources — Patient, Observation, Encounter — over plain REST and JSON, the same web every developer already knew. Open-licensed, by design.
Grahame Grieve · father of FHIRResources for Health
2018–2019
FHIR R4 — the foundation goes normative
With R4, the core resources stabilized into a normative standard you could build a business on without fear of the ground shifting. Patient. Condition. Observation. The vocabulary of modern interoperability was set.
This is the platform. Theirs, not mine. What follows is the engineer who bound his whole career to it — the old standard and the new alike.
FHIR R4 · normativeSMART on FHIR · OAuth
A human story in segments
An HL7 message looks like delimiters. Inside, it’s a patient.
MSH, PID, PV1, ORC, OBR, OBX — pipes and fields. The genius of HL7 v2 was that it made healthcare operations computable without forgetting the workflow underneath: a patient arriving, an order placed, a result returning.
MSHWho sent it, who receives it, and what event just happened.
PIDWho the patient is.
PV1Where they are in the care journey.
ORCWhat was ordered.
OBRWhat test or observation was requested.
OBXWhat result came back.
Behind every pipe is a handoff. Behind every handoff is a patient, a clinician, and a workflow that has to keep moving.
Now — the work continues
Asmir Hasanbegovic — I learned the standard end to end
I started where everyone starts now: on FHIR — REST, JSON, resources, the modern face of everything Grahame Grieve set in motion. I could have stayed there. Most do.
So I went back to the foundation: back to Simborg’s commons, back to v2 — ADT, ORM, ORU, the pipe-delimited messages that still carry most of the clinical data moving in this country. I learned the standard from the 1987 storm forward, then went and delivered it: 200+ HL7 and FHIR interfaces across 20+ states and 17 EMR platforms, including VA and DoD ecosystems, on Mirth Connect, Corepoint, and Epic Bridges.
That is the throughline. From a 1987 ADT message to a FHIR R4 resource served over OAuth, there is no layer of this standard I haven’t shipped in production — old and new are the same craft to me.
I didn’t pick a side of the standard. I learned all of it — because a patient doesn’t care which version moved their data.
200+ interfaces20+ states17 EMR platformsVA · DoDv2 → FHIR R4 · end to endEpic Bridges · certified
HL7 Interfacing Inc.
Founded in New York, 2022 — built in the hardest rooms in healthcare.
HL7 Interfacing Inc. was incorporated in New York in 2022 — not to chase logos, but to do the work most integrators avoid: the VA, the DoD, and international health systems where the network is unreliable, the stakes are lives, and the standard is the one thing in the room everyone agrees on.
The path ran from federal interoperability — VA and DoD ecosystems, where a single mismatched field is a patient-safety event — outward to international clients who needed that same rigor under far harder conditions.
2022 · Ukraine
The same year the company was formed, we interfaced for humanitarian teams sending aid into Ukraine — building the pipes that captured retina scans of the wounded and turned them into remote patient care delivered off those scans, when no clinician could be in the room.
That is what the standard is for. Not compliance, not a checkbox — a wounded person getting care because their data could move when they couldn’t.
The foundation, in delivered work
200+
HL7 & FHIR interfaces delivered
20+
states covered
17
EMR platforms
VA·DoD
federal interoperability ecosystems
100%
go-live rate
1987
the year it all started — not with us
Figures sourced from documented professional experience.
Where the work landed
228 labs, mapped to where they actually are.
At 21, finishing my bachelor’s, I taught myself the APIs and ran 20 lab interfaces concurrently — then brought 228 labs into production as the sole interface analyst. Every dot is a real deployment — its city, lab, client and EMR — pulled from the same database behind asmirhasanbegovic.com. Hover any dot.
Real deployment — hover for lab, client & EMR228 deployments · 23 states · live from Supabase
Now — the puzzle
Now I’m using the standard to solve the hardest puzzle in healthcare.
Every interface was preparation for this: taking the same FHIR R4 resources the founders built, and using them to match real patients to the trials that could change their lives. Every point on the globe is a live recruiting site, geolocated — drawn from the same database that powers asmirhasanbegovic.com.
66,000+
recruiting sites
21,000+
active trials
152
countries
Loading live trial sites…
Drag to rotate · scroll to zoom · hover a site for the trial
I didn’t just inherit their standard. I inherited how they thought.
Don Simborg · 1985
He put StatLAN into the public domain because a proprietary protocol wasn’t going to survive — healthcare needed something open, or nothing would connect at all.
My version of that same bet: using AI to drive healthcare SaaS license costs down, so the value flows to the organizations and the patients — not into a moat. Open beats owned. It did in 1987, and it still does.
Grahame Grieve · FHIR
His rule for FHIR was the 80/20: nail the part everyone agrees on, keep it simple and stable, and leave a clean way to extend for the rest. Free the health data.
That is exactly how I build a clinical-trial match — solve the 80% of eligibility that’s real and structured on FHIR R4, extend cleanly for the edge cases, and never let perfect become the enemy of a patient getting matched.
Ed Hammond · the long game
He spent decades turning a volunteer idea into governed, accredited national infrastructure — patient, durable, unglamorous work that outlived every hype cycle.
It’s why I went back to v2 instead of chasing only the new thing — and why I want to put real EMR systems in front of the developing world. The standard only matters if it actually reaches the bedside.
Where this is going
The same standard, pointed forward.
Clinical trials, at the center. My heaviest focus — expanding the auto-match engine beyond the clinic and into testing sites, so eligibility detection on FHIR R4 puts real patients in front of the trials that actually fit them.
Piloting healthcare SaaS, with the clients. Standing up and proving new healthcare products alongside the organizations that will use them — built with care teams, not at them.
AI inside the products that already exist. Integrating intelligence into the EMRs and platforms healthcare already runs on, meeting clinicians where they work instead of asking them to move.
AI that lowers the bill. Leveraging AI to drive down SaaS healthcare license costs — so organizations get more for every dollar they spend, and the AI budget buys more care, not less.
EMRs for the rest of the world. Bringing real electronic medical record systems to the developing world — the same interoperability these founders built, delivered where it’s needed most.
The portfolio
The work behind the standard.
HL7 Interfacing is one half of the story. The full build — the case studies, the advisory, the automation, the clinical-trial engine — lives at asmirhasanbegovic.com.
We don’t claim the standard. We respect it, implement it, and carry the work forward.
Talking HL7 is talking the foundation. We just try to honor it.
If you’re building on the same standard these people gave the world — or you want to build what comes next, from clinical-trial matching on FHIR R4 to AI inside the products healthcare already runs — reach out directly.