In 1958 Ross Karlson, having just graduated from an engineering program, started with Riverside Construction in London, Ontario. By 1972, he worked himself up to Vice President of the company with a stake in ownership. In 1973, Riverside Construction was sold to TCG Materials where Ross went on to become Senior Vice-President until his retirement in 1994.
In 1984, Tory Karlson, the son of Ross, joined TCG Materials in the Marketing division. From 1984 until 1989 he worked himself into a management position. One of his clients was Ronson Paving & Construction, which was formed in 1984. Tory realized the potential in this young company and in 1989 purchased Ronson Paving.


