Dr. Rosberger is a leading researcher in clinical health psychology, mostly in the area of psychosocial oncology. For more than 20 years, he has served as the Director of the Psychology Division at the Jewish General Hospital. Over the past 8 years, he has led the development of the Louise Granofsky-Psychosocial Oncology Program in the Segal Cancer Centre of the Jewish General Hospital. He is also Senior Investigator at the Lady Davis Institute for Medical Research, Jewish General Hospital; and Associate Professor in the departments of Psychology, Psychiatry and Oncology, at McGill University.

His current research programs focus is on the prevention of Human papillomavirus (HPV), which is the most common sexually transmitted infection. He and his team are interested in the mechanisms of HPV vaccine decision-making for parents for their young children and adolescents, and young adults who are at higher risk of infection.

He is co-leading a major imitative to improve patient care in oncology through a collaborative project between the Rossy Cancer Network at McGill and Cancer Care Ontario through the implementation and evaluation of patient reported outcome and experience measures. He has additional collaborations with colleagues studying: psychosocial needs of head and neck cancer patients; coping interventions with adolescent and young adult cancer patients; patients receiving brachytherapy for colorectal cancer; and fertility issues among boys and men in the general population and those experiencing a cancer diagnosis.