Prof. Ren maintains an active practice treating patients born with cleft lip and palate, as well as other craniofacial anomalies. She is a consultant orthodontist on the Cleft Lip and Palate Team of Northern Netherlands.

Prof. Ren’s research interests cover (oral) biofilms and biomaterials, tissue reactions during tooth movement, treatment of cleft lip and palate, and 3D imaging and technology. She has published and lectured extensively on her research in these fields.

Prof. Ren has an h-index of 57, with over 12,000 citations. She serves as a board member in several renowned national and international professional organizations and as an editorial member/associate editor for various scientific journals. She is the chairperson of the Orthodontics Consilium in the Netherlands, and President-Elect 2029 of the EOS.