Founders David Mertins and John Bates met while working for an electronics distributor, where they learned the business from the inside out—how products move, how relationships are built, and how projects come together behind the scenes.
At first, they couldn’t have been more different. David was more reserved and thoughtful, focused on details and structure, while John was outgoing, energetic, and naturally drew people in. What initially felt like a contrast soon became a strength. Their opposite personalities created a balance—combining careful execution with strong relationships—and laid the foundation for an unlikely friendship. Over time, that friendship grew into a shared vision for something better in the smart home and electronics industry.
By 2015, that vision became clearer. Both David and John felt a pull toward building something of their own—something rooted in integrity, accountability, and a higher standard of service. They saw a gap in the industry: companies were completing installs, but not always standing behind their work. They believed clients deserved more.
So in the summer of 2016, Grand Slam AV & Security was born.
Like any business starting out, the early days came with challenges. There was a learning curve—refining processes, defining roles, and navigating the realities of building something from the ground up. But instead of accepting the industry’s “normal,” they chose to raise the standard.
They focused on doing things right the first time. Clear expectations. Thoughtful execution. No shortcuts.
As the company grew, so did its focus. What started as taking on any opportunity evolved into being intentional—partnering on projects where they could be involved from start to finish and fully stand behind the outcome. That level of involvement leads to better systems, smoother experiences, and long-term trust with every client.
At Grand Slam, the job doesn’t end when the install is complete. The relationship continues. Challenges are handled with honesty, accountability, and a commitment to making things right.
At its core, the company operates on a simple set of values:
Do the work. Take responsibility. Keep improving. And always follow through.
That foundation is what continues to drive Grand Slam forward.
Guided by faith, grounded in integrity, and committed to serving others well.
Founder
John’s background in electronics distribution and sales laid the foundation for what he does best—building genuine relationships. Though he studied Biology at Oklahoma State University, he quickly found his calling in working with people and helping bring ideas to life.
John leads the sales side of the business and serves as the primary point of connection for clients throughout each phase of a project. From the first conversation through planning and execution, he is often the face and voice of the company—ensuring clients feel heard, understood, and confident every step of the way. His ability to connect comes naturally, and his approach is rooted in listening first and serving well. Over time, that consistency has built lasting trust with clients and partners alike.
Outside of work, John is a dedicated family man and active in his church. He enjoys time on the golf course, follows baseball closely, and brings the same energy and authenticity to his personal life as he does to the business. At home, life stays lively with a couple of goldendoodles and a cat in the mix.
Founder
David brings a strong foundation in electronics wholesale, backed by a Business degree from the University of Houston and experience working with companies like Best Buy and Circuit City.
As a business owner, his role quickly expanded beyond what he once knew—overseeing operations, managing inventory, ensuring business compliance, and planning for long-term growth. While John focuses on sales and relationships and the crew handles installations, David manages the rest of the business, keeping everything organized, aligned, and moving forward. He thrives in the details, making sure nothing falls through the cracks.
More importantly, David is a devoted husband, father of three, and a man of faith. When he’s not working, you’ll find him at his kids’ games, spending time with his family, or serving within his church community. His commitment to faith and family carries directly into how he leads—grounded, steady, and always focused on doing what’s right.