Doug's business career saw him found several successful businesses including Cory Johnston (Aust) Pty Ltd and Doboy Cold Stores P/L. As a meat exporter and wholesale butcher, Cory Johnston Pty Ltd relied heavily upon the Cold Storage Industry. In 1976, Doug purchased six acres of land on Lytton Road, Hemmant, with the intention of entering the Cold Storage Industry. In 1979, on this site and under the name of Doboy Cold Stores Pty Ltd, Doug built his first cold store. When the fledgling site was opened, it consisted of two Refrigerated Chambers, two Blast Freezers and a holding capacity of 2000 pallets.
In 1980, Doboy became a member of the Cold Storage Association of Australia (CSA), and Doug became an ardent supporter. He consistently held various committee positions within the CSA, including CSA State Chairman (1992-93); and in its successor, the Refrigerated Warehouse and Transport Association (RWTA), as a Board Member (1993-99), until his semi-retirement in 1999.
During his 21 years as Managing Director of Doboy Cold Stores P/L, Doug was a passionate supporter of the R.W.T.A, holding various executive positions including Chairman of the RWTA's Qld Chapter. In 2000, Doug was honoured with the RWTA's highest accolade, Life Membership.
