Theo Ruers was trained as surgeon in Maastricht and  Eindhoven, he specialised in surgical oncology at Kings College Hospital and the Hammersmith Hospital in London (1992-1994). After a positions as surgical oncologist in Maastricht and Nijmegen, he became head of the Division Surgical Oncology at The Netherlands Cancer Institute Amsterdam (2007).  He was appointed in 2010 as clinical professor at the Technical University of Twente  on the application of biomedical imaging and treatment strategies in oncology.

Theo Ruers is heading a research division at the The Netherlands Cancer Institute focussed on imaging techniques for diagnosis and treatment of cancer. This research concentrates around topics of electromagnetic surgical navigation and optical tissue diagnosis by diffuse reflectance spectroscopy and hyperspectral imaging. His focus is to optimize surgical interventions by the introduction of technology and AI in the OR, leading to better surgical and patient outcome. His passion is to bring these technologies to the market. Before he co-founded Juvant medical in 2025, he was co-founder of Sirius Medical in 2017 and of Bcon medical in 2021.