Dr Gert Jan Wijlhuizen is a specialist in, among others, cycling safety (bicycle infrastructure, behaviour), public health and road safety, the elderly and injury consequences. Gert Jan coordinated several projects in which instruments for safety assessment of road infrastructure – for cyclists and motorized traffic – were developed and applied. He also coordinates an international project on the stimulation of a safe modal shift from car to walking and cycling in the urban environment.
In 2009, Gert Jan Wijlhuizen obtained his PhD at Leiden University on the thesis Physical activity and falls in older persons: development of the balance control difficulty homeostasis model.