Dr. Ruellas started as a faculty in the Department of Orthodontics at the University of Michigan (School of Dentistry) in January 2018. He has taught undergraduate, graduate and PhD students at the Federal University of Rio de Janeiro, RJ, Brazil for 22 years. He completed dental school in 1989, residency training in 1995 and received his PhD in 2001. He is a board-certified orthodontist by the Brazilian Board of Orthodontics.

Dr. Ruellas works directly with graduate students as a didactic and clinical instructor. He currently serves as the Graduate Orthodontic Clinic Director and as Course Director for the biomechanics course. He also sees patients in the faculty associates practice.

Dr. Ruellas has published over 100 scientific papers on Materials Science, Biomechanics, tooth movement and, more recently, on 3D imaging. His research interests nowadays are mainly on 3D imaging applied to the clinic. He is interested in studying treatment results, relapse, skeletal and dental effects of different therapies, and also the application of 3D imaging for diagnosis purposes.