Meet Debbie Castleberry

Debbie began her real estate career in 1980 at the Collin County Multiple Listing Service where she worked for 13 years. In 1995, she became a Licensed Realtor and began listing and selling properties. In 2003 she joined The Milstead Team as an Administrative Assistant/Realtor and has been a key part of the team since. Her beginning role on the team was to manage distressed properties as well as handling the closing coordination. Her duties included everything from listing and pricing to maintenance and finally all the way through the closing process. Debbie is currently working as a buyer’s agent as well as listing/closing coordinator. We could not be happier with her ability to assist clients in choosing the perfect home and coordinating the closing smoothly.


With her Real Estate Certificate from Collin County Community College and the immense amount of knowledge and experience she brings to the team Debbie creates a balance and steadiness necessary for the diversity that The Milstead Team offers. She also has the following designations:

  • Certified Corporate Property Specialist

  • Certified Residential Marketing Specialist.


Debbie and her husband Gary are lifetime residents of Collin County where Gary has built a name for himself as a Premier Builder for Dave R Williams Homes in Prosper/Celina area. Debbie brings to the team, a vast knowledge of the new home builder industry. From her knowledge of construction to contracts, Debbie’s experience is vast. Debbie and Gary have 2 children, Tanner and Kimberly. Tanner a 2004 Graduate of Prosper High School, he is married to Holly (Johnson) owns his own Landscaping Company in the Prosper area. Tanner & Holly have a daughter Brooke & son Beau. Kimberly is a 2009 Graduate of Prosper High School and a 2013 Graduate of Texas Christian University, with a degree in Middle School Education. Kimberly is an 8th grade Math Teacher at Fort Worth ISD and is married to Joshua Patterson, they have 3 son’s Jett & twins Keith & Kane. In her spare time other than being a Grandma to Jett, Brooke, Beau, Keith & Kane. She enjoys watching TCU football & soccer. She also enjoys traveling & hunting.

Holly Milstead
Holly Milstead
7200 University Drive #300 McKinney TX 75071