About the Real Estate Standards Organization (RESO)
RESO is an independent, nonprofit standards body formed to develop data standards and processes that create efficiencies for all participants in real estate transactions. Our member organizations include MLSs, brokerages, REALTOR® associations and technology partners serving nearly two million real estate professionals.
RESO’s mission is to create and promote the adoption and utilization of standards that drive efficiency throughout the real estate industry. Our vision is a streamlined real estate technology industry.
2025 RESO BOARD OF DIRECTORS | RESO STAFF
ABOUT OPEN STANDARDS | RESO TODAY | OUR HISTORY | AWARDS
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BROKERS | MLSs | TECHNOLOGY PARTNERS
Rebecca Jensen
Chair
Midwest Real Estate Data (MRED)
John Breault
Vice-Chair
State-Wide MLS
Melissa King
Secretary
OneKey® MLS
Richard Renton
Treasurer
Triad MLS
Bob Evans
Class B Director
Move
Caitlin McCrory
Class D Director
Anywhere Real Estate
Dan Troup
Class B Director
Broker Public Portal
Dan Weisman
Class A Director
National Association of REALTORS®
Greg Moore
Class C Director
Regional Multiple Listing Service (RMLS)
Janine Sieja
Class F Director
Realtors Property Resource (RPR)
Joseph Szurgyi
Class B Director
MLS Grid
Joe Wilhelmy
Class D Director
RE/MAX
Katy Davenport
Class C Director
First Multiple Listing Service (FMLS)
Matt Cohen
Class B Director
Cotality
Matt Hendricks
Class B Director
Zillow
Michael Hayes
Class B Director
Homes.com
Michael Wurzer
Class C Director
FBS
Patrick Pichette
Class F Director
The Canadian Real Estate Association (CREA)
Rodney Gansho
Class A Director
National Association of REALTORS®
Shayne Fairley
Class C Director
Stellar MLS
Ross Buck
Advisor
Omni MLS
Marty Reed
Advisor
California Regional Multiple Listing Service (CRMLS)
Sam DeBord
Chief Executive Officer
919.504.9898
sam@reso.org | Bio
Suzanne Biegenzahn
Chief Operating Officer
919.504.9894
suzanne@reso.org
Joshua Darnell
Chief Technology Officer
919.504.6234
josh@reso.org
Greg Sax
Head of Communications
612.860.2668
gsax@reso.org
Claire Northrop
Creative Director
919.504.9897
claire@reso.org
Jason Darrough
Technical Product Manager
919.289.5163
jason@reso.org
Brian Ohnesorgen
Membership Manager
919.504.6235
brian@reso.org
Meridith Tugwell
Project Manager
919.504.9894
meridith@reso.org
About Open Standards
Open standards organizations, like RESO, exist in most industries to ensure technology advancement. Two well-known examples are W3C, which creates the standards for the World Wide Web, and Bluetooth SIG, which creates wireless technology standards. The most powerful technology companies in the world agree to collaborate to build these standards and raise the technology foundations of all competitors.
This is why you can use the same web apps on nearly any phone and why you can connect that phone to nearly any pair of headphones. The products are built on open standards.
In real estate, RESO’s standards are created to promote that same experience: interoperability between MLS, broker, agent and consumer technology tools.
RESO Today
RESO’s standards and services have grown significantly over time.
- RESO Web API: The upgrade for real estate data transfer, replacing RETS.
- Data Dictionary: The industry’s universal language for data.
- Universal Property Identifier (UPI): A global solution for accurate property representation.
- Unique Organization Identifier (UOI): An accurate key to REALTOR® associations, MLSs and technology companies.
- Unique Licensee Identifier (ULI): An in-development standard to bring an accurate key ID for every sales licensee in the industry.
- Workgroups: RESO members collaborate to develop standards for Internet tracking, event models, payloads, interoperability, metadata and more.
- New organizations continue to join RESO and expand the positive effects of standards.
RESO’s core values align with those of open standards organizations across the globe. Our processes and products are collaborative, business-driven, transparent, innovative, open, inclusive and measurable. | RESO Bylaws
Our History
In 1999, the National Association of REALTORS® (NAR) joined forces with leaders in technology to explore ways to make access to MLS data easier for real estate brokers, agents and their technology partners.
In 2002, NAR created an official workgroup, which would eventually become RESO. This workgroup created the first version of the well-documented Real Estate Transaction Standard (RETS).
RESO was incorporated in November 2011 as an independent, not-for-profit trade organization. Soon after, it released the industry’s Data Dictionary, followed by the RESO Web API, which replaced RETS. Over 500 MLSs have been certified on these standards.
Since 2020, RESO standards implementations have expanded outside of the U.S. including MLSs and technology companies across the Americas, Europe, the Middle East, and Australia.
