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Welcome to the 2025 GIS/Valuation Technologies Conference, taking place in Columbus, Ohio, March 3-6, 2025! This is where you review the comprehensive educational program for the conference and plan your agenda.

The Geospatial Professional Network (formerly URISA) and the International Association of Assessing Officers are once again pleased to co-host this important event. Attendees earn ample IAAO CE credits and GISP Education points.

More education! Attendees requested more workshops - the opportunity to dive deeper into important topics. So we have included four half-day workshops to the conference on Thursday afternoon. Be sure to check them out and plan accordingly!

Go to this page to register for the conference and make travel plans and review sponsor and exhibit packages. Take note of early bird discounts through January 6!
or to bookmark your favorites and sync them to your phone or calendar.
Venue: Pheoris West B– 3rd Floor clear filter
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Tuesday, March 4
 

10:30am EST

Valuation Unchained: Machine Learning’s New Neighborhood
Tuesday March 4, 2025 10:30am - 12:00pm EST
Pheoris West B– 3rd Floor
This session introduces a novel method to improve location adjustments using a machine learning methodology and explores the creation of neighborhood boundaries by examining how these boundaries might impact mass valuation models.

  • Enhancing Property Location Adjustments Using Spatial Interpolation
    Daniel Fasteen, Ph.D., Senior Data Scientist, Tyler Technologies, Rosemount, MN
  • What’s New in the Neighborhood?
    Russ Thimgan, President, Thimgan & Associates, Goodyear, AZ
    Leah Thimgan, Operations Director, Thimgan & Associates, LaJunta 
Moderators
TS

Thomas Swingle

Deputy Assessor, Adams County
Speakers
avatar for Daniel Fasteen, PhD

Daniel Fasteen, PhD

Senior Research Scientist, Tyler Technologies
Daniel Fasteen, Ph.D. is a Senior Research Scientist with Tyler Technologies.  Since 2010, Daniel has worked various roles in both the private and local government sector as a CAMA manager, product manager, research scientist, and consultant focusing on GIS application, property... Read More →
avatar for Russ Thimgan

Russ Thimgan

President, Thimgan & Associates
Russ extended experience in the assessment field, coupled with involvement in Ad Valorem Taxation since 1988, makes him a valuable asset in determining assessment needs. With an Economics degree, he is an expert in mass appraisal.His work with over 30 different jurisdictions and lending... Read More →
avatar for Leah Thimgan

Leah Thimgan

Operations Director, Thimgan & Associates
Tuesday March 4, 2025 10:30am - 12:00pm EST
Pheoris West B– 3rd Floor
  MODELING & VALUATION

2:00pm EST

Moneyball for Commercial Real Estate: Sales, Income, and AI Models
Tuesday March 4, 2025 2:00pm - 3:30pm EST
Pheoris West B– 3rd Floor
This session explores the key variables that drive successful commercial sales and income models. It compares sales and income models, examining when each is most appropriate, and highlights the benefits of AI in model formats. The session also offers insights into integrating these models with CAMA systems and addresses challenges in valuing mixed-use buildings by applying location and use-specific rates.

  • Commercial Sales and Income Models
    Robert Gloudemans, FIAAO, Mass Appraisal Consultant, AZ
  • Valuation of Multi-Purpose Buildings
    Kevin Keene, Owner/Operator, Keene Mass Appraisal Consulting, Philadelphia, PA
Moderators
avatar for Megan Lukens

Megan Lukens

Assessment Business Systems Manager, City of Madison
I fell into the assessing world with Tyler Technologies back in 2002. I have had opportunities to work at the jurisdictional level, the county level, and for an oversight agency at the state level. I currently work for the City of Madison, WI as the Assessment Business Systems Manager... Read More →
Speakers
avatar for Robert Gloudemans, FIAAO

Robert Gloudemans, FIAAO

Mass Appraisal Consultant
Bob is a Mass Appraisal Consultant and longtime partner in the partnership. Almy, Gloudemans, Jacobs & Denne. Previously he worked for IAAO and the AZ Dept of Revenue.Bob provides consulting services in mass appraisal and ratio studies and has assisted over 100 clients in the U.S... Read More →
avatar for Kevin Keene

Kevin Keene

Owner/Operator, Keene Mass Appraisal Consulting
Kevin Keene served the City of Philadelphia for over 30 years as a Real Property Evaluator; Mass Appraisal Analyst; Real Property Supervisor; GIS Manager; Modeling Director and Director of Mass Appraisal and Analysis. He personally designed and directed over sixteen major revaluation... Read More →
Tuesday March 4, 2025 2:00pm - 3:30pm EST
Pheoris West B– 3rd Floor
  MODELING & VALUATION

4:00pm EST

SHAPs and Rec: Navigating Valuation with SHAP and Time Trend Methods
Tuesday March 4, 2025 4:00pm - 5:00pm EST
Pheoris West B– 3rd Floor
This session will showcase how machine learning and SHAP values can reveal inequities in property valuations, offering actionable insights into the drivers of disparities. Join this session to also explore a comparison of current time trend methods with the Kalman filter approach for building time adjustments, enhancing valuation accuracy.

  • Practical Implementation of Rocket Science in Developing Time Trends
    Jeremy Eye, Senior Data Analyst, Boulder County Assessor’s Office, CO
    Wendell Salas, Senior Data Analyst, Boulder County Assessor's Office, CO
  • Enhancing Ratio Studies with AI: Identifying Sources of Inequity with SHAP Values
    Paul Bidanset, Founder/Research Scientist, Center for Appraisal Research and Technology, Virginia Beach, VA
    Joe Werhli, Enterprise Architect, Tyler Technologies
Moderators
avatar for Daniel Fasteen, PhD

Daniel Fasteen, PhD

Senior Research Scientist, Tyler Technologies
Daniel Fasteen, Ph.D. is a Senior Research Scientist with Tyler Technologies.  Since 2010, Daniel has worked various roles in both the private and local government sector as a CAMA manager, product manager, research scientist, and consultant focusing on GIS application, property... Read More →
Speakers
JE

Jeremy Eye

Senior Data Analyst, Boulder County Assessor’s Office
Jeremy Eye is a Senior Data Analyst/Modeler for the Boulder County Assessor’s Office, where he has worked for the last year building property valuation models and researching novel approaches to mass appraisal.  He spent his early career engaged as a proprietary trader in the commodity... Read More →
WS

Wendell Salas

Senior Data Analyst, Boulder County Assessor's Office
Wendell Salas is Senior Data Analyst and Modeler for the Boulder County Assessor’s Office, where he has worked for over 3 years.  He develops residential and commercial models for Boulder County and works with the Assessor’s staff to improve data collection, quality, and integrity... Read More →
avatar for Paul Bidanset

Paul Bidanset

Founder/Research Scientist, Center for Appraisal Research and Technology
Paul Bidanset is an international AVM consultant and founder of the Center for Appraisal Research and Technology (CART), a nonprofit dedicated to promoting appraisal equity through free research, workflows, and technology. He has most recently worked with the governments of Moldova... 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... Read More →
Tuesday March 4, 2025 4:00pm - 5:00pm EST
Pheoris West B– 3rd Floor
  MODELING & VALUATION
 
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Monday, March 3
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Alfred Tibor- 3rd Floor
Aminah Robinson ABC – 5th Floor
Charles Massey – 3rd Floor
Kojo Kamau Ballroom – 4th Floor
Pheoris West A – 3rd Floor
Pheoris West B– 3rd Floor
Robinson Foyer
Roman Johnson – 3rd Floor
Spencer C– 5th Floor
TBA
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  • Keynote Address
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