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Our Company History

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A century of protection

Milton Pierce used to build his own burglary alarms in the 1930s from salvaged brake drum rims rigged to a striker apparatus. He attached these bells to buildings, covering them with wooden orange crates painted red. A handful of those early alarms are still on buildings in Detroit. Our sensors and alarms are more sophisticated today, but we still take pride in our company history and will continue the legacy Pierce built.

Milton Pierce Starts Guardian Alarm

June 7, 1930
Milton Pierce Starts Guardian Alarm

During the Great Depression and at the age of 15, Milton Pierce started a burglar alarm company in his neighborhood. A few years later, he expanded and purchased Guardian Alarm in Detroit, Michigan.

Adding Guard Services

May 13, 1970
Adding Guard Services

The Guardian Guard Services division is established to provide physical security throughout Michigan and Ohio.

Continued Growth

March 10, 1975
Continued Growth

Guardian Alarm is ranked the 14th largest security company in the United States and has continued to be top-ranked.

Armored Cars Begin Patrol

October 25, 1980
Armored Cars Begin Patrol

The Guardian Armored Security division is established to provide armored car and cash processing services. This division was sold in 2007.

Growth Through Mergers

January 19, 1982
Growth Through Mergers

Automatic Alarm and Certified Alarm, both owned by Milton Pierce’s sons Richard and Douglas, merge with Guardian Alarm.

Guarding Our Seniors

November 15, 1999
Guarding Our Seniors

The Guardian Medical Monitoring division is established to help seniors with personal help buttons, medication management and wander management devices.

Growing Down in Florida

April 6, 2004
Growing Down in Florida

The Guardian Alarm division expands into Florida through acquisitions of several security companies.

75 Years of Continued Protection

June 7, 2005
75 Years of Continued Protection

Guardian Alarm is ranked the 14th largest security company in the United States and has continued to be routinely ranked in the top 20.

The Legacy Passes On

September 24, 2010
The Legacy Passes On

The Guardian Alarm founder, Milton Pierce, passes away at the age of 95. A true pioneer, Pierce set the example with his motto: “Give the customer good service. Take good care of them and they will take care of you.”

Protection Expands in Ohio

July 6, 2011
Protection Expands in Ohio

The Guardian Alarm division expands further into Ohio through the purchase of Complete Protection from Cincinnati Bell.

Securing 85 Years

November 9, 2015
Securing 85 Years

The Guardian Alarm family proudly celebrates our 85th Anniversary and we look forward to continuing the legacy of innovation and industry-leading standards.

A New Chapter Begins

March 2, 2017
A New Chapter Begins

The Pierce family sells Guardian Alarm to Certares L.P & BlackRock, Inc. after 87 years in business.

Detect. Deter. Defend.

March 1, 2019
Detect. Deter. Defend.

Guardian Alarm launches Virtual Guardian, a new 24/7 video monitoring service creating real-time remote security solutions with the latest technology like two-way video-voice communication.

Guardian Alarm Expands

April 6, 2022
Guardian Alarm Expands

Guardian Alarm acquires Sievers Security, an independently-owned security company based in Cleveland, OH. This acquisition expands Guardian Alarm’s footprint in Ohio by continuing to be the largest security company in the Midwest.

The Expansion Continues

May 20, 2022
The Expansion Continues

Guardian Alarm acquires Executive Security Consultants, a locally owned and operated security company based in Columbus, OH. Established in 1988, ESC brings along a trusted presence in the Columbus community that Guardian Alarm will help expand for years to come.

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