Thomas Gregory was one of the million Irish people who immigrated to the U.S. to escape the Great Potato Famine. 

He settled in Brooklyn, New York, and began working at Lefferts Galvanizing Works, where he ascended to the position of superintendent. 

Thomas Gregory founded his own after-fabrication business, The Thomas Gregory Galvanizing Works (TGGW).

The business prospered under Thomas Gregory’s leadership. 

After their father's death, Thomas M. Gregory and William Gregory assumed ongoing management of the company.

Thomas M. Gregory established the Hanlon and Gregory Galvanizing Company, located in Pittsburgh, Pennsylvania. 

The company opened and closed a manufacturing operation in Buffalo, New York.

TGGW upgraded to a state-of-the-art facility in Maspeth, New York.

The Gregorys purchased a captive galvanizing operation in Newark, New Jersey, and converted it into a custom after-fabrication galvanizing plant.

Four of the male Gregory children died, leaving George I. Gregory as Thomas Gregory’s only male survivor.

World War II began, creating a significant need for galvanized products.

The Maspeth and Newark plants flourished under George I. Gregory’s leadership, and the Hanlon and Gregory Galvanizing Company became the largest fabrication galvanizing facility in the country. 

After he was honorably discharged from the U.S. Army, T. Raymond Gregory joined the family galvanizing company, working his way up through all areas of the business.

T. Raymond Gregory moved his family to Pittsburgh, Pennsylvania, to assess the viability of Hanlon Gregory Galvanizing Company, which he determined should be liquidated.  

He returned to work for TGGW in Maspeth, New York, believing the potential for galvanizing growth was better in the Midwest.

T. Raymond Gregory formed Gregory Galvanizing and Metal Processing, headquartered in Canton, Ohio. 

When George Gregory passed away, T. Raymond Gregory took over operations at the company’s various locations. 

The operation in Canton, Ohio, installed a 52-foot galvanizing kettle, the largest in the industry. 

The newly formed Gregory Bridge Co. and Gregory Fabricating Co. produced the Stearns Bayou Bridge, the first hot-dipped galvanized bridge in the U.S.

As the company expanded, a second galvanizing kettle became necessary. A new wing was created to house a 16-foot kettle in a facility referred to as Plant II, and the 52-foot galvanizing kettle in Plant I was expanded. 

The company organized Gregory Galvanizing and Metal Processing of Pennsylvania in Hazelton, a wholly owned subsidiary with an adjoining utility pole manufacturing plant. 

Reduced demand for galvanizing resulted in the liquidation of TGGW, Gregory Bridge Co., Gregory Fabricating Co. and Gregory Galvanizing and Metal Processing of Pennsylvania. 

After his honorable discharge from the U.S. Army, T. Stephen Gregory joined the family business at the Hazelton plant.  

The facility in Canton, Ohio, continued to make steady profit, and the company began pursuing new areas of growth, including the production of C-cross section galvanized fence framework for U.S. Steel's Cyclone Fence Unit.

U.S. Steel gradually transferred much of its forming equipment to Gregory, culminating in the development of the new entity, Gregory Roll Form Co., which was jointly owned by Zinc Tool and Die Co.

Zinc Tool and Die Co. sold their interests to Gregory Roll Form Co., and C-Post fence framework became a signature product offering for the company.

T. Raymond Gregory built a continuous flux galvanizing operation at the plant in Canton, Ohio, as a cost-effective alternative to after fabrication. Through specialized galvanizing capabilities, Gregory was able to achieve heavy zinc thicknesses not previously attainable through continuous galvanizing.

Disaster struck when a major fire destroyed the entire continuous galvanizing facility, leaving only the roll forming equipment to be salvaged.

After acquiring a 155,000-square-foot industrial building in Canton, Ohio, T. Raymond Gregory created a second-generation galvanizing line.

Steel invoicing opened the door to additional profit opportunities which would eventually grow to become a significant part of the business.

The company began exploring the possibility of guardrail galvanizing, requiring the widening of the galvanizing equipment and trade acceptance of continuous galvanizing.

Test site evaluations qualified continuously galvanized guardrails for use in government jobs as well as private sector applications, and Gregory grew to become a leading guardrail supplier.

There was greater opportunity for entering the strut market as a full line supplier rather than a galvanized steel supplier, so Gregory developed its own line of strut channel, G-STRUT®.

The company's continuous galvanizing operations continued to grow, and Gregory became a significant supplier of highway, fence and eventually channel strut products.

T. Matthew Gregory joined Gregory Industries after receiving a bachelor’s degree in management from Wittenberg University. His first assignment was at the 13th Street plant in Canton, Ohio, where he first worked in inside sales and then operations scheduling. 

In consideration of the company's continued growth and diversification, its name was formally changed to Gregory Industries.

T. Matthew Gregory was promoted to the position of superintendent at the after-fabrication galvanizing facility and then became plant manager. 

After receiving his master’s degree from Akron University, T. Matthew Gregory was promoted to vice president of operations. The after-fabrication galvanizing plant became too costly to compete with other regional galvanizers and the company decided to sell the division.

Gregory Industries opened a new downsized after-fabrication galvanizing facility to keep up with the growing need for steel coil processing and guardrail post galvanizing.

T. Matthew Gregory took on the role of executive vice president and assumed the responsibility for designing a state-of-the-art automated fabricating and galvanizing facility for the highway division.

Gregory Industries acquired its longtime customer Mid-Ohio Tubing, expanding the company’s roll forming capabilities to include steel tubing and metal building components. 

T. Matthew Gregory was named chief executive officer of Gregory Industries. 

Gregory Industries rebranded, formalizing its core business divisions. Gregory Tube headquarters moved to Decatur, Alabama.