In this study, we test the knowledge corridor theory as an explanation of university professors' involvement in the early stages of research commercialisation. A statistical analysis was made of a sample of full professors from the engineering, natural sciences and medical faculties at a large public university in Sweden. The analysis shows that not only entrepreneurial experience but also private sector work experience significantly influence the ability to identify and develop business ideas based on research. Moreover, the analysis shows that research–based business idea generation increases faster for professors with private sector work experience who as well have more time for research in their positions.