Brett Marquard is a nationally recognized expert in healthcare interoperability, specializing in standards-based health data exchange. He is the Original and Primary Editor of the HL7 US Core Implementation Guide, the foundational set of FHIR profiles adopted by the U.S. healthcare system for API-based access to patient data.

Since its inception, Brett has served as a subject matter expert for the Argonaut Project, guiding industry-wide FHIR adoption across data query, document exchange, provider directory, and CDS Hooks. For the past five years, he has served as Program Director for Argonaut, supporting strategic planning and national alignment.

Brett is Vice Chair of HL7’s US Realm Steering Committee, helping shape the direction of U.S.-focused interoperability standards. He has also held editorial leadership roles on major HL7 specifications, including the Consolidated Clinical Document Architecture (C-CDA) and Quality Reporting Document Architecture (QRDA), both referenced in ONC certification criteria. Millions of C-CDA documents are exchanged every day across the U.S. healthcare system to support transitions of care, helping ensure essential clinical information travels with the patient.

Earlier in his career, Brett led interoperability efforts at Epic Systems, facilitating the development of Care Elsewhere, a key component of Epic’s data exchange infrastructure using IHE XDS. He continues to train implementers, developers, and policymakers on HL7 FHIR, CDA, and Version 2 standards.

Qualifications Summary:

  • FHIR expert with profile development spanning DSTU2 to R4.

  • Expert in HL7 CDA, C-CDA, Continuity of Care Document (CCD), FHIR, QRDA, Healthcare Information Technology Standards Panel (HITSP) components of CDA (e.g. C32), and Integrating the Healthcare Enterprise (IHE) Patient Care Coordination Technical Framework Profiles.

  • Devised project plans, staffing recommendations, training material, and specifications for successful exchanges between electronic healthcare records and third-party applications.

  • Direct manager or adviser on the implementation of over 150 HL7 version 2 exchanges.

  • Project director for HL7 Version 3 CDA interface technology for Epic Systems Corporation.

  • Facilitated development of Epic Care Elsewhere, now included in Care Everywhere, a product to connect Epic to outside organizations through the use of IHE Cross-Enterprise Document Sharing (XDS).

  • Proficient in MUMPS and Caché.