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Current Officers

Charles E. Brady III, GISP

City of Ardmore, OK


Since 2000 I have been the GIS Coordinator for the City of Ardmore, OK. During that time I have been involved in managing and overseeing every aspect of municipal mapping, focusing heavily on GIS Implementation and its integration into 911, Surveying, Photogrammetry, Emergency, and Asset Management. I currently serve as the appointed Municipal Representative for the Oklahoma State GI Council as well as several other leadership roles throughout my local, state, and regional GIS community.

Regardless of whether you have a whole GIS department with staff and a large budget or you are the one person shop with only a strong desire to work and a big job ahead of you, my goal has and always will be, to ensure that SCAUG is there to help you. At the end of the day my desire is for you to feel educated, successful, welcome, and appreciated by SCAUG. Personally I welcome your ideas to continue building on what SCAUG offers to the GIS community in order to insure SCAUG continues to be your professional home base for the future.

Shellie Willoughby, GISP

OK Office of Geographic Information

Vice President

Shellie Willoughby is the GIS Manager for the Oklahoma Conservation Commission for which she has worked for the past 25 years.  While working for the Oklahoma Conservation Commission she has been heavily involved in the coordination efforts of the Oklahoma GI Council as well as the Oklahoma Office of Geographic Information, where she currently serves as the Assistant State GIS Coordinator.  Prior to working for the Conservation Commission, Shellie received her B.S. and M.S. degrees in Geography from Oklahoma State University

As a member of SCAUG for 24 years Shellie has served on the SCAUG Board in various positions  as well as held multiple positions in the Oklahoma Chapter of SCAUG, where she currently serves as Chair.  Shellie loves to travel with her family and has been to 49 of the 50 states.

James Allen

Carter County, OK


James Allen graduated from East Central University in 2005 with a Degree in Cartography/Geography. James has been employed as the GIS Coordinator for Carter County, OK for 7 years, and he also serves as the IT Director and various other jobs for the county. He has been a member of SCAUG for 10 years and has served as the regional Treasurer since 2011.

Ronald Vaughn

City of Plano

Executive Board Member at Large

  Bill Hodge GISP

 Conference Coordinator


I have stepped down from my role as Executive Director of GISCI, a position I held for  8 years prior to retiring. 

In retirement, I do not intend to leave the geospatial profession, to which I have dedicated the last 20+ years of my life. I'm having too much fun to quit, completely, now. So I seek to use my time and experience where it can be utilized to help a solid organization continue to grow.

The Board position at SCAUG allows me to continue that 'family association' with a group with which I have been involved since I started in 2008, when I first became GIS Division Manager at the City of Midland, TX.

I appreciate and welcome the opportunity to become even more strongly connected to one of the strongest regional GIS organizations that exists!   Thanks to all who voted to make this continuing journey possible.

Madeline Dillner

Oklahoma Corporation Commission

Oklahoma Representative

"Everything is related to everything else. But near things are more related than distant things.” 

When one of my professors told us Tobler’s first law of geography in college, I knew I’d found the right profession. I live to find patterns and show them to others. When I was 12 I read the book Life by the Numbers that talked about fractals in nature, and it was intoxicating to me. It taught me that patterns can be observed, noted, and used to make predictions in the natural world. That is, patterns bring order to what seems like chaos. So, this analysis of patterns became a constant, underlying hum in my thoughts throughout my life. Naturally, this led me to geography in college—the study of patterns and arrangements of places and people. Before graduation, I had begun working for the Oklahoma Corporation Commission as a GIS intern, and today I am the Project Coordinator for the OCC Brownfield Program, and I manage the Oklahoma Historical Aerial Digitization Project. GIS and cartography, especially the Story Map capabilities of ArcGIS Online, are the perfect instruments for displaying patterns in beautiful ways, and I love them for that. I am happy to be part of a group that appreciates them as I do. In my free time, I like to continue my pattern-seeking by exploring the US and the world, and painting and writing to express what I find.

  Derrick Holland

 City of Port Arthur, TX

 South Texas Representative

Derrick Holland is a 1989 Honors Graduate of Lamar University's Institute of Technology Department, receiving an Associates of Applied Science Degree in Computer Aided Design Drafting. Derrick began his drafting career with a local engineering company and Texaco Research and Development's Environmental Research Division. In 1993 Derrick began his employment with the City of Port Arthur's Public Works Engineering Division as a Senior Engineering Technician. In June of 2013, the City of Port Arthur began to implement its newly formed GIS Division where he was awarded the position of GIS Coordinator.

                                   Tracey Foster Milton, GISP 
Waggoner Engineering, Inc

Mississippi Representative

Tracey Foster Milton, GISP., is a GIS and Asset Management Director with a background in both local government and civil engineering. With extensive GIS experience that expands almost 30 years, Tracey leads her team in creating and managing solutions that span across various disciplines. These solutions encompass a range of activities, including data creation and editing, location-based data analysis, exhibit design, GIS web application development, and more. Tracey excels in project management, advanced data analytics, ArcGIS Enterprise solutions and Cityworks. Her educational background includes a Bachelor of Arts (B.A.) in Urban Planning with a GIS concentration from Jackson State University.

Daniela Spade

Center for Spatial Analysis


Garri Grossi

City of Carrolton, TX
North Texas Representative

Garri has over 20 years of Geographic Information Systems experience in both the public and private sectors. Areas of focus include Public Safety, Training, Location Analytics, Marketing Insights, Storytelling, and Minesweeper. He is a graduate of the University of North Texas' Geography Department and has earned an ESRI ArcGIS Desktop Associate, CompTIA CTT+, is a Certified Professional Category Analyst, and other super boring accreditations.

You may remember Garri as SCAUG Past-Treasurer and is very excited to once again serve you!

Candace Perry

Center for Spatial Analysis

Conference Coordinator Elect


 John W. McEwen, PhD, GISP

 Duplantis Design Group

 Louisiana Representative

As the Louisiana Representative for SCAUG, John's goal is to strengthen the bridge between private and public sector GIS in Louisiana and work to get more students involved with SCAUG as the next generation of GIS professionals. John is a 2014 graduate of the Geography & Anthropology program at Louisiana State University (LSU) and loves geography. His academic background is in human & cultural geography but John always kept a foot in the professional GIS world from working through college as a GIS intern to providing GIS support in the disaster consulting industry. John is the GIS Manager for Duplantis Design Group (DDG) in Baton Rouge.

Traci Tracey

Esri Representative:


Grayson Wylie

Student rep:

SCAUG is a not for profit organization dedicated to benefit users of ESRI’s geographic information software | Founded in 1990 | © SCAUG 2019 |

South Central Arc Users Group

P.O. Box 96

Ardmore, OK 73402

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