Company History

Trusted for Over 30 Years

Building a solid foundation for valley home-builders for 30 years, GMS Concrete Specialists Inc; continues to thrive in what has sometimes been a rather volatile residential housing market.


Guadalupe M Medina and Gloria Barnes established G & G Concrete Specialists Inc.

Guadalupe seized the opportunity to make G & G a family business after his partner decided to pursue other endeavors. The name changed to GMS Concrete Specialists Inc., since then, family members have solely owned the company. With a career spanning more than 50 years, Guadalupe offers experience, integrity, and is seriously committed to customer satisfaction while building a future for his family and his employees families.Paul Medina, his oldest son, has over 30 years’ experience and has assisted Guadalupe in building the company with strategic growth plans. In his role as President, he oversees General Operations while building customer and vendor relations in the field.

Jon Medina joined the company in 1994, with service and construction experience, to assist with Field Operations and Customer Relations.


In 1996 Guadalupe recruited his daughter, Andrea Medina in from the banking industry, to streamline the administrative needs as well as improving the financial and accounting reporting of the business. Andrea is an Alumni of ASU where she received her degree in Accounting.In the same year, Matthew Medina was also recruited away from an established career with a Valley Home Builder in to assist with the strategic growth plans, modernizing the bidding process to increase competitiveness.

In 2003 Guadalupe truly made it a family business, and enlisted his oldest daughter Catherine Medina. Catherine brings over 30 years of successful Business Operations and Human Resource management from the Service and Retail industry. The addition of Catherine has assisted the company with the changing face of Construction as it relates to human resources, automation, and operations.

Despite the many obstacles faced today by construction companies in the housing market, GMS remains a leader in the residential & light commercial concrete industry. GMS understands and focuses on maintaining its numerous outstanding relationships with the industry’s contractors and suppliers. Contrary to other concrete companies in Arizona, GMS has maintained an impressive customer base. Among these clients are leading valley home-builders who build from 50 to 2000 homes a year. GMS also caters to custom and semi-custom home-builders contributing around 20 to 50 homes annually.

The Future

GMS looks forward to expanding its operations to meet the growth in the valley of the sun. Outside of the company’s residential production work, GMS Concrete’s history has truly grown and expanded with a business acumen that has encompassed the importance of family while establishing a positive record of accomplishment of growth in the “Valley of the Sun” with plans to remain for years to come.