Stefan is a Chartered Psychologist and Associate Fellow of the British Psychological Society. He has 27 years’ experience in patient centered outcome research across a range of clinical and surgical disciplines. Stefan’s main area of interest is in developing, applying, and improving mixed methods psychometric research in clinical studies and therapeutic trials. He is especially interested in maximizing the interpretability of existing and new patient centered outcome instruments.

Stefan is also co-developer of Q-Portfolio patient reported outcome (PRO) instruments (including BREAST-Q©, FACE-Q©, BODY-Q©, and CLEFT-Q©), which have been used widely in clinical research, trials, practice, guidance, registries, audits, and quality improvement initiatives. Stefan has co-authored 200 articles in patient centered outcome research in peer review journals (H-Index 59).