Principal of the Victorian School of Forestry 1928-1951
Known fondly to his students as E.J. or Teddo, he immediately introduced a new and broad curriculum of subjects and set high personal standards. The academic rigour of the course was ensured by a Board of Examiners headed by the Professor of Botany at the University of Melbourne, Professor Alfred James Ewart. Semmens had studied under Ewart at University and its believed that Ewart put Semmens name forward to the Forests Commission as candidate for Principal of VSF in 1927. Semmens also enjoyed strong support from the Chairman of the Forests Commission, Alfred Vernon Galbraith after the acrimonious split between Victoria and the Australian Forestry School in Canberra in 1930. E.J generously made himself available to guide his pupil's study and sporting habits and also cultivate their diverse interests. Many of his students later established themselves as notable leaders with the Forests Commission after graduating from VSF. Two students, James Hamlin Willis, and Richard Bond became outstanding botanists, while many others established prominent careers within the National Parks Service, Fisheries and Wildlife, Soil Conservation Authority, teaching at tertiary institutions or the private forestry sector. Some like Alfred John Leslie became truly international foresters. An active field-botanist himself, E.J. accumulated a large and valuable collection of plant specimens and personal sketches for the expanding school herbarium and was elected a Fellow honoris causa of the prestigious Linnean Society of London in 1935 for his outstanding work. In addition, Semmens also conducted some pioneering research into the composition of eucalyptus oils and his steam kilns are part the University of Melbourne museum collection at Creswick. Edwin James Semmens retired after 23 as Principal of the Victorian School of Forestry at the end of 1951, aged 65 years, after having made a lasting impression on hundreds of young forestry graduates. Francis Robert Moulds then replaced Semmens as the Principal until the end of 1956.
Local historian and community leader
During the 1940s and 50s, very few people seemed interested in preserving and cataloguing Australia's history, but Semmens prodigiously collected an eclectic range of materials relating to the local region. An avid archivist, Semmens later donated some of his collection of early documents, photos, paintings and artefacts to the Creswick museum which he helped establish, but the bulk of his collection was bequeathed to the University of Melbourne Archives. This vast and diverse collection has been described as "one of the most important collections of local history source material assembled in Australia". Semmens was always active in his local community, working not only to establish the fledgling Creswick Museum, but presiding over the Creswick District Hospital between 1948–51, as well as serving 24 years as a councillor of the Shire of Creswick, with a stint at Shire President in 1956. On 8 June 1968, Edwin James Semmens was honoured in the Queen's Birthday List with a Member of the Order of the British Empire for services to local government. Later in 1977, in recognition of his outstanding and lasting legacy to forestry and local history, the University of Melbourne conferred a Doctorate of Forest Science honoris causa. A new accommodation block at the forestry school was named in his honour. He remained active in his local Creswick community after retirement and died on 31 December 1980 aged nearly 93.