Mason Investment Group, LLC

Our Team

Justin Mason, Broker

President and CEO

Justin was born and raised in the Fort Worth area and is very familiar with the local real estate market.  While he did not formally begin his real estate career until 2012, he always had an interest in real estate and real estate investing. He and his wife, Theresa, created Mason Investment Group, LLC in early 2012, and Justin began working with investor clients who were looking to purchase rental properties.  He gained a lot of experience early on in residential real estate transactions, leasing and property management, and at the same time, began building his reputation as a successful Realtor and business man.  He obtained his Broker’s license in August of 2017. He enjoys working with homeowners looking to buy or sell properties in the DFW area, as well as local residential real estate investors.

Justin served five years in the United States Navy. After completing his honorable service, he served the City of Arlington, Texas as a police officer for six years. He has a bachelor’s degree from the University of North Texas and a master’s degree from the University of Texas at Arlington. Justin also sings and plays country music throughout the DFW area and State of Texas.  He and his wife/business partner reside in Grapevine and have 3 children.

Justin is a member of the National Association of Realtors (NAR), the Texas Association of Realtors (TAR) and the Grapevine Chamber of Commerce.  Justin is also a certified Veteran’s Land Board (VLB) Realtor.

Click here to contact Justin.

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Theresa Mason

Theresa Mason, Realtor

Vice President and COO

Theresa has always had an entrepreneurial spirit. Upon graduating from the University of Notre Dame, she went into business with her mother painting wall murals. This first company, Wall2Wall Art, LLC paved the way for her next business venture, W2W Painting, LLC. As president of this residential and commercial painting company, she learned many business management skills and developed a passion for business growth and development. She also discovered her desire to use these skills to give back to the community. This desire led to the birth of R.O.L.L. O.N., a non-profit organization that distributes home building supplies and materials to disaster relief charities and other community organizations.

Despite staying busy with these companies, Theresa jumped on the opportunity to go into business with Justin as they began to talk about the potential of a real estate company. Theresa’s experience in business combined with Justin’s knowledge and passion for real estate made the creation of Mason Investment Group, LLC (MIG Real Estate) possible. Together, their individual talents and skills along with the support of their team allow MIG Real Estate to perform at an elite level.

Theresa stays very active in her church and in the community. She served as the President of the Notre Dame Club of Dallas in 2010; she served as a member of the City of Grapevine’s Planning and Zoning Commission from 2013-2017; and she currently serves on the Grapevine Chamber of Commerce Board of Directors as the immediate Past-Chair.  Theresa is a proud mom of 3 little ones, loves listening and attending Justin’s shows and looks forward to continuing to grow this great company!

Click here to contact Theresa.

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April GadociApril Gadoci


April is a born and raised Texan. She grew up in Corpus Christi and after high school, relocated to the DFW area. Shortly after she and her husband, Drew, were married, they moved to the state of Delaware as a result of Drew’s station assignment with the United States Air Force. Four years later they moved back home to Texas, and April got a job with Southwest Airlines as a Recurrent Training Coordinator. She always enjoyed working with others, and the 2 years that she spent working at Southwest were some of her most fun and memorable times! When she and her husband decided to start their family, April chose to end her career with Southwest and stay at home with their new baby. April was a stay-at-home mom for 2 and a half years and cherished the time she spent at home with her two daughters. As the girls got a little bit older, though, April longed to go back to work to be around others in a professional setting. The real estate field seemed to be a fantastic compromise for her; she would have the opportunity to work flexible hours selling real estate and still be around for her beautiful children. So, in 2011 she jumped into her real estate career and has not looked back! She joined the MIG Real Estate team in 2013, and has really enjoyed being a part of this growing company.

April volunteers for Promises of Tomorrow a charitable organization, providing genetic testing, education, and a support platform for the children of breast cancer victims. She is also a member of the National Association of Realtors (NAR) and the Texas Association of Realtors (TAR).

Click here to contact April.

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Jaymie TenpennyJaymie Tenpenny


Jaymie’s life is and has always been rooted in the value of family. Everything she has accomplished personally and professionally has been driven by her true passion of building strong families and relationships. Out of college, Jaymie, along with a business partner founded “A Perfect Day,” a full-service wedding/event consulting firm.

As Jaymie and her husband decided that it was time to concentrate on the branches of their own family tree, she decided that she was being led into a direction away from the strenuous schedule that was the wedding business. After some time at home concentrating on her own small children, Jaymie discovered a new passion–helping friends and family members find homes. She found that she loved hearing and seeing the feelings that new home owners had when they found “their dream home.” After encouragement from her family, Jaymie decided that her sales and marketing background, coupled with this passion for real estate, was a perfect fit to accomplish the career goals she had for herself.

After completing real estate school, Jaymie found a home to start her career in the office of Keller William’s Southlake. Through over three years of gaining knowledge and experience, she used the resources that a large real estate broker offers to build a firm foundation and gain confidence in her trade.

When approached with the opportunity to join Mason Investment Group, Jaymie found that the Masons’ goal of providing excellent service with integrity was exactly the same as the ideal on which she had based her whole career. Whether it’s a family looking for the perfect environment to raise their children, or a buyer looking to make a sound investment to better the future of their family, the vision of MIG fit perfectly into Jaymie’s idea of what a real estate team should be and should strive to accomplish for its clients.

Jaymie and her husband raise their two young sons in North Fort Worth, TX.  In her spare time she loves interior design, cooking, and finding time to volunteer where she can, including teaching Sunday School at her church in Grapevine.

Click here to contact Jaymie.

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Keith Hotop


Keith Hotop was born and raised in Southeast Missouri. He has always had a heart towards service and helping others, which has fueled his career paths. He graduated with his doctorate of physical therapy in 2013 and soon afterwards moved to Texas and began working at a local hospital as a physical therapist. He and his wife bought a house in Grapevine and through the house buying process he developed a growing interest in real estate. After continuing to learn more about the DFW real estate market, he made the decision to pursue his real estate license. Becoming a licensed real estate agent has provided Keith with another opportunity to combine one of his many passions with his heart for helping others. He looks forward to developing relationships with his clients, collaborating with them, and guiding them through the process of buying or selling their home.

Keith enjoys spending his free time with his wife, Jolee, and their young daughter. He is an active member at their church in Grapevine. He is also a member of the National Association of Realtors (NAR) and the Texas Association of Realtors (TAR).

Click here to contact Keith.

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Seth Dingas


Seth became interested in real estate while in college after begrudgingly writing his first rent check. Since then, he has developed a passion for real estate and real estate investing. As a realtor, his intention is to make the often stressful process of buying and selling property as simple and transparent as possible for his clients.

Seth graduated with both his bachelor’s and master’s degrees from Texas A&M University. He works full-time for a community bank where he oversees the bank’s anti-money laundering program and related compliance functions. Between banking and real estate, he is a public speaker devoted to various leadership and Christian topics.

Seth has a lovely wife, Kayla, and a curious little girl, Ainsley. When mom and dad aren’t working, you can find this trio spending time with family friends, watching the Aggies and the Cowboys, volunteering at church, or exploring what DFW has to offer.

Click Here to contact Seth.

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Natasha Smith


Biography coming soon!

Click Here to contact Natasha.

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Sherry Mason

Texas & Florida Realtor

Sherry grew up in Texas and has worked in various aspects of Real Estate for the 30+ years. She began her Real Estate career in 1986 working for a husband & wife owned Real Estate / Appraisal Company. She managed residential property for Investors and assisted the Appraiser as well.

In 1997 she began her career at Primeco / Verizon Wireless. As the Regional Property / Facilities Manager, Sherry was responsible for daily commercial Facilities Operations for administrative buildings throughout TX. Her responsibilities included; Tenant representative from white box to CO, life/safety/security, 24/7/365 maintenance of two level 1 data centers, space planning, moves and changes, mail room services, security, contract and vendor management.

In 2006 her career shifted to Retail Real Estate Operations. As the Region Manager, she was responsible for daily Facilities Operations for 100 (+/-) locations throughout TX & LA. She was responsible for leading the Facilities team through construction/design process for retail locations, protecting company assets by placing an emphasis on preventative maintenance, Business Continuity and Disaster Recovery.

Her extensive knowledge & experience in property management has made her a valuable asset to the MIG Real Estate team. She advises the team on property management strategies and has helped create efficient systems and processes for MIG.

During her career she pursued further education where she earned the following Designations;

  • Commercial: RPA® – Real Property Administrator, FMA® – Facilities Management Administrator
  • Residential: SRES® – Seniors Real Estate Specialist

During her career she was a member of the following organizations.

  • Building Owners and Managers Association, (BOMA) Fort Worth Chapter (18) Years
  • International Facilities Management Association (IFMA) Dallas Chapter (18) Years
  • Oakbrook Condos HOA – Vice President (5) Years
  • Professional Retail Store Maintenance Association (PRSM) National Chapter (10) Years
  • Women in Facilities Management (WIFM) Austin Chapter (3) Years

Current Memberships

  • Building Owners and Managers Association, International – BOMA
  • Florida Association of REALTORS®  – FAR
  • National Association of REALTOR® – NAR
  • REALTORS® of the Palm Beaches & Greater Fort Lauderdale – RAPB+GFLR

Family is very important to Sherry. She has 2 children and 5 grandchildren; she is the baby of 7 and has a twin brother!

Click here to contact Sherry.