In the late 1960s, Lang Walker, along with his Father Alec Walker, established A & L Walker Pty Ltd in New South Wales as a plant hire and earth moving contractor.
In 1972, Lang Walker founded The Walker Group, a company specialising in the new roads construction, and subdivision development.
In 1977, The Walker Group began residential development activities.
Throughout 1979 and 1980, the group undertook the development of a number of small office buildings and lower-density residential projects throughout southern Sydney.
In the late 1980s, the Group focussed on residential and industrial development projects, and civil engineering projects in Brisbane, Melbourne and Sydney.
In 1988, The Walker Group was officially renamed to Walker Corporation Pty Limited.
In 1993, the corporation participated in the establishment of the listed property trust The Industrial Property Trust of Australia, as a joint manager with Macquarie Bank Ltd.
In 1994, the company floated. Lang Walker retained his position as the Managing Director, while projects under the control of Walker Corporation Limited went on to generate over $2 billion in sales revenue, while employing over 375 full-time staff.
In 1999, Lang Walker elected to sell his held shares in Walker Corporation Ltd to Australand Holdings Limited, to focus on running his private development company McRoss Developments Pty Ltd. Mr Walker reserved the right to reuse the Walker Corporation name after January 2003.
In 2000, the company acquired the Queensland property Hope Island Resort, including an 18-hole golf course, and approximately 2,000 housing allotments.
In 2003, Lang Walker exercised his right to reuse the Walker Corporation name, renaming McRoss Developments Pty Ltd as Walker Corporation.
In 2006, Walker Corporation sold over $1.25 billion worth of assets to Mirvac, while continuing to develop over 20 projects across Retail, commercial, residential and industrial sectors.
In 2008, Walker Corporation began its first Malaysian development, beginning work on Senibong Cove, a mixed-use development situated across 213 acres of waterfront land in Johor Bahru.
In 2010, Walker Corporation began work on its largest project to date – Collins Square, Australia's largest mixed-use development, located in Melbourne's CBD.