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About Us

Security One was established in Memphis in 1973. Since its inception, Security One has grown to become one of the largest contract security providers in the region with offices in the Midwestern and Southern regions of the United States. Our clients include Fortune 500 companies, government facilities and a broad spectrum of commercially owned and managed properties like warehouses and distribution centers, financial and banking institutions, retail shopping centers and residential and gated communities.

Corporate Headquarters - Memphis, Tennessee
901.346.7746 (office)
866.776.7851 (toll free)
Pictured: (L to R) Barry Marshall, Cindy Philips and Dale Castleberry.

Dale Castleberry was an integral part of the Security One ownership team prior to his passing in 2016. To read more about Dale and his history with Security One, click here.


Over 650 Security One employees work to protect the Mid-South, Midwestern and Southern regions of the United States. With 24-hour manned operations centers, state certified training centers and full-service security solutions, Security One officers provide high quality protection for your business.

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The Security One Difference

Security One provides armed and unarmed officers, executive/VIP protection as well as commercial and residential security patrol. We also specialize in emergency planning and environmental security design. We keep our promise to serve you.

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Keeping The Promise

Security One keeps its promises. We provide exceptional customer service, use state-of-the-art technology, encourage creativity, demand integrity and accept responsibility. Take advantage of our security solutions by contacting us today.

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