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Wednesday, February 24
 

9:00am PST

Low Country, High Standards
Wednesday February 24, 2027 9:00am - 10:00am PST
Willow, 3rd Floor
The Netherlands is giving vertical equity analysis a modern makeover, moving from outdated tools to new metrics, international standards, and cutting-edge research. This session explores how Dutch assessors are incorporating IAAO standards, new equity measures, and practical online tools to better understand, monitor, and address vertical inequity.

Luc Hermans, Global Chief Officer/Data Scientist, Netherlands Council for Real Estate Assessment – Netherlands
Gijs Deen, Data Analyst, Netherlands Council for Real Estate Assessment - Netherlands

Keywords: Statistics & Ratio Studies, Assessment Equity, Intermediate
Speakers
avatar for Luc Hermans

Luc Hermans

Chief Global Officer/Data Scientist, Netherlands Council for Real Estate Assessment
Luc is the Chief Global Officer for the Netherlands Council for Real Estate Assessment, in this role he is involved in international projects and collaborations. Next to that Luc is a PhD-candidate at Ulster University.
GD

Gijs Deen

Data Analyst, Netherlands Council for Real Estate Assessment
Gijs is a Data Analyst at the Netherlands Council for Real Estate Assessment
Wednesday February 24, 2027 9:00am - 10:00am PST
Willow, 3rd Floor
  Valuation & Assessment Science

10:30am PST

Prediction Is Easy. Explain Yourself
Wednesday February 24, 2027 10:30am - 12:00pm PST
Willow, 3rd Floor
Machine learning can do more than predict values. It can help us understand why properties behave similarly, identify meaningful comparables and adjustments, and reveal how markets organize themselves across space. This session moves from opening the machine learning black box to drawing data-driven neighborhood boundaries, showing how explainable AI, information theory, and even techniques borrowed from gerrymandering can turn complex algorithms into practical market insight.

Gerrymandering for Explainability: Automated Neighborhoods Using Gerrymandering Algorithms and Information Theory
Keywords: Artificial Intelligence & Machine Learning, GIS & Spatial Analysis, Intermediate
John Kossa, Data Scientist, Lee County Property Appraiser’s Office - TX

Explainable Machine Learning for Mass Appraisal: From Prediction to Market Insight
Keywords: Artificial Intelligence & Machine Learning, Mass Appraisal & Valuation Modeling, Advanced
Joe Wehrli, Enterprise Architecture Manager, Tyler Technologies - OH
Speakers
JK

John Kossa

Data Scientist, Lee County Property Appraiser
John Kossa is a data scientist for Lee County Property Appraisers in Fort Meyers Florida. He previously worked as a senior software engineer for property valuation startup Valuebase and the satellite internet company Viasat. His main interests are solving deep technical puzzles and... Read More →
avatar for Joe Wehrli

Joe Wehrli

Enterprise Architecture Manager, Tyler Technologies
Joseph Wehrli (Joe) is an enterprise architect and computer scientist at Tyler Technologies, where he conducts research and development in property valuation and tax administration systems.

Joe has contributed to a wide range of property valuation and tax administration products and projects, including collaborations with New York City, Washington DC, the City of Boston, Hennepin County (MN), Sedgwick County (KS), and international agencies such as the British Columbia... Read More →
Wednesday February 24, 2027 10:30am - 12:00pm PST
Willow, 3rd Floor
  Valuation & Assessment Science

2:30pm PST

Defend This! Machine Learning Under the Microscope
Wednesday February 24, 2027 2:30pm - 3:30pm PST
Willow, 3rd Floor
Machine learning may produce great valuations, but can you explain and defend them when someone challenges the result? This session puts ML on the witness stand, exploring how models perform against IAAO ratio study standards, how complex predictions can be translated into explanations taxpayers and appeals boards can understand, and how assessors can build the documentation needed to make machine learning valuations defensible

Will Jarvis, CEO and Founder, Valuebase - NC

Keywords: Artificial Intelligence & Machine Learning, Assessment Appeals, Statistics & Ratio Studies, Beginner
Speakers
avatar for Will Jarvis

Will Jarvis

Founder/CEO, Valuebase
Will Jarvis is the Founder and CEO of Valuebase, with extensive experience in product management, data science, and business development. Since founding Valuebase in 2023, Will has raised over $8 million in venture capital to support the development of AI-powered property. His leadership... Read More →
Wednesday February 24, 2027 2:30pm - 3:30pm PST
Willow, 3rd Floor
  Valuation & Assessment Science
 

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