We are moving our operations and combining office spaces with our sister company Electronic Support Systems (ESS) at their location in Bridgeton, Missouri.

The new space for RJI will provide additional office area and expanded warehouse opportunities. In addition, we will have a technical training center and our information technology(IT) will be supported by ESS’s on-premise data center. The critical infrastructure in the data center is equipped with Vertiv (Liebert) equipment includding: UPS, in-row cooling, power distribution, racks and rack mounted power distribution. All of this equipment is tied into the iCOM and Packet Power monitoring.

This will be effective November 15th, 2021.

All email and phone numbers will remain the same. However, the mailing address will now be

Rollie Johnson, Inc. (RJI)

12926 Hollenberg Drive

Bridgeton, Missouri 63044

Please update your records with this address change for Rollie Johnson, Inc. (RJI) at your earliest convenience.

I acquired Electronic Support Systems (ESS) at the beginning of January 2021. ESS formerly known as ESP (Electronic Support Products) was a part of RJI’s portfolio of companies prior to 1992.  When Liebert (Vertiv) made a representative change the new company was then formed in 1992 called Electronic Support Systems (ESS) that has represented the full Vertiv (Liebert) product line for many years.

RJI and ESS will continue to operate as independent business units to support the local industries HVAC and Critical Infrastructure applications.

The connected history between the two companies ESS and RJI has now come full circle after being apart for 29 years. The synergy of the companies will not only provide a larger footprint in the St. Louis construction market and surrounding area but will offer a greater array of products and services to ultimately provide engineered solutions to the customer.


Dave’s Signature

David Zimmerman, PE

Rollie Johnson, Inc. (RJI)