Laidlaw began in 1924 when founder Robert Laidlaw created Laidlaw Transit, a trucking service company in Hagersville, Ontario.

Beginning in 1972, under the leadership of Michael DeGroote, Laidlaw, Inc. began growing through acquisitions of other companies when it acquired a Canadian intercity and charter bus company. In 1979, it acquired a Canadian contract school bus business. In 1978 it entered the U.S. solid waste industry. In 1983, Laidlaw entered the U.S. school bus transportation sector with its acquisition of ARA Transportation, a major contract school bus provider which also owned a Wayne Corporation bus dealership. In 1984, Laidlaw Inc. exited the trucking business, as the company began a consolidating smaller school bus contracting companies in the U.S. and Canada. In 1988, Laidlaw, Inc. purchased a controlling interest in itself from Canadian Pacific Limited, parent of Canadian Pacific Railway.

Instances of reverse privatization were rare, but did occur during Laidlaw's years of expansion. In Virginia, several school districts canceled their school bus contracts with private operators and brought bus operations in-house. By the late 1980s, the only 3 remaining district school bus contracts were at Petersburg, Norfolk and Hopewell. Self-operation conversions for all three were urged by Virginia Department of Education officials as "cost-saving." The contracting companies unsuccessfully disputed the state's financial calculations and cost allocations for the reverse privatizations, which effectively ended all public school bus contracting in Virginia by 1996. In 1991, after losing its major school bus contract in Norfolk, Virginia to a governmental conversion to district-self-operation, Laidlaw sold the rest of its urban-suburban bus line, school bus contracting business serving independent schools and day camps, and related assets in the Norfolk area to Virginia Overland Transportation. Virginia Overland Transportation was an operator of public service transportation and a much smaller industry consolidator in the state. The company had also lost their contract in Petersburg to self-operation in 1989, but was still operating at Hopewell. The latter converted in 1996, and Virginia Overland's parent company based in Richmond closed in 2004. The former Virginia Overland subsidiary operation in the Norfolk area acquired from Laidlaw operates as Transquest and is now owned by Serco. As of 2007, Transquest was continuing bus contract operations transporting students to many independent schools in South Hampton Roads, including Norfolk Academy.

In the 1990s, Laidlaw continued to acquire hundreds of smaller school bus and public transit contractors in the U.S. and Canada. These also included major competitors, including Mayflower Contract Services in 1995, and National Bus Service in 1996.^[5] In 1993, Laidlaw acquired San Diego based MedTrans, a high quality industry leader which began as Harrison Ambulance in San Diego, operating emergency medical services operating in California, Washington, Nevada and Texas, and continued to grow it through 138 acquisitions across the country, reaching over $1B in revenue. Glen Roberts was the MedTrans CEO and Donald Jones, COO, at the time of the Laidlaw acquisition. In 1998, the company acquired American Medical Response, another nationwide U.S. ambulance service provider and CareLine, Inc., U.S. ambulance consolidator of smaller ambulance contractors. In 1996, Laidlaw sold its solid waste business to Allied Waste Industries.^[6] Allied Waste sold the Canadian operations to USA Waste Services, Inc. Laidlaw American branches were re-branded to many different names, depending on their location.

In 1998, a watershed year, Laidlaw Inc. acquired Greyhound Lines U.S. operations, Greyhound Canada, the DAVE Companies (specialists in paratransit) and emergency management companies EmCare and Spectrum Emergency Care.

After incurring heavy losses through its investments in Safety-Kleen and Greyhound Lines and after almost 20 years of expansion, Laidlaw Inc. filed for protection under Chapter 11 of the U.S. Bankruptcy Code in June 2001. Laidlaw International, Inc. listed its common shares on the New York Stock Exchange (Ticker: LI), on February 10, 2004, and emerged from reorganization on June 23, 2003, as the successor to Laidlaw Inc. Canadian Pacific sold its remaining 17% interest in Laidlaw Inc. The company later sold American Medical Response and EmCare, its EMS contract operations, to new owners.

Laidlaw Waste Systems edit

In 1969 DeGroote began to expand beyond trucking by acquiring a solid waste management company. In the 1970s he would increasingly focus on waste management and other areas, shifting away from the boom-or-bust trucking industry, which had a tendency to rise and fall with the economy. Garbage, on the other hand, always had to be dealt with. In 1978, Laidlaw entered the United States solid waste industry, Laidlaw Waste Systems, a wholly owned subsidiary of Laidlaw Inc, In 1986 Laidlaw acquired Genstar Corp (GSX) of Boston and in 1996 then sold its solid waste business to Allied Waste Industries and many former Laidlaw operations where then rebranded to local names depending on the locations. Laidlaw sold the Canadian operations to USA Waste Services, Inc. Laidlaw American branch's where re-branded to many different names, depending on the location of were they were. After incurring heavy losses through its investments in Safety-Kleen and Greyhound Lines. After almost 20 years of expansion, Laidlaw Inc. filed for protection under Chapter 11 of the U.S. Bankruptcy Code in June 2001.

• First Student (United States) - successor company
• First Student Canada - successor company
• FirstGroup
• Greyhound Lines

• • Historical business data for Laidlaw International Inc.:
  • SEC filings
• • Historical business data for Laidlaw Global Corp.:
  • SEC filings