Human Factors Engineering is an interdisciplinary science concerned with the effect of work on the human body and its relationship to the workplace. Since the 1970s, UNB – Forest Engineering has been a major contributor to teaching and research in this discipline, and in its application to forest operations. Rapid advances in mechanized tree-harvesting systems resulted in significant new workplace issues for operator health, safety, and machine design. Researchers responded by creating a CSA standard, working cooperatively with FERIC, CPPA and more recently the CWF, and founding the International Journal of Forest Engineering, which is a unique source for research results and developments in this discipline. Future research will involve multi-national teams of Human Factors Engineers, supported by related disciplines in healthcare and engineering. Key words: human factors, forest engineering, workplace health, workplace safety, mechanized forest operations