In 1953 the Department of Health for Ontario organized the Ontario Sanitary Inspectors' Training Course which was housed at Ryerson, the same year Ryerson introduced a two-year Public Health Laboratory Technology certificate at the request of governmental public health laboratories to supply competent personnel in the public health laboratory field. The course evolved into the Medical Laboratory Technology Course later in the 1950s and was still offered at Ryerson when the Sanitary Inspectors Course came under complete control of Ryerson from the Department of Health in 1961-1962.
In 1967-1968, the Public Health Inspector's course became a two-year course, with the one-year phased out in the same year. In 1970-1971, a two-semester Environmental Health Administration Program was added to prepare public health inspectors for senior posts and to provide background for further studies in this field. In 1980-1981 Ryerson offered a new four-year degree program in Environmental Health. In 1998 the School of Environmental Health changed its name to the School of Occupational and Public Health.