Tobias Van Reenen is a senior researcher at the Council for Scientific and Industrial Research (CSIR), focusing on ventilation and indoor environmental quality. He has extensive experience in designing and constructing pharmaceutical, cleanroom, and high-level bio-containment facilities. His expertise includes the design of engineering controls for laboratories, operating theatres, ICUs, and isolation wards. Tobias has contributed to developing regional and international standards, guidelines, and regulatory frameworks related to hazardous biological agents and engineering controls to reduce the risk of indoor airborne transmission. He consults with local and international industries on best practices in this area. One of his ongoing pet projects is a digital airborne infection risk monitoring solution for TB and COVID, using CO2 as a proxy for real-time risk modelling and management. He is a research team lead in industrial thermal energy efficiency in the energy sector and contributes to energy demand management research in the built environment. His efforts in supporting the development of regulations and standards continue to improve the safety and quality of indoor environments, positively impacting public health and safety.