Glyn Elwyn is a physician-researcher, Professor and Senior Scientist at The Dartmouth Center for Health Care Delivery Science and The Dartmouth Institute for Health Policy and Clinical Practice, Dartmouth College, USA.
He was previously a professor at Cardiff University where he led the Decision Laboratory, developing and evaluating decision support interventions such as Prosdex , Amniodex  and Bresdex , tools that help clinicians achieve shared decision making.
He first completed an arts degree in Bangor, North Wales, where he was taught by Bedwyr Lewis Jones and Gwyn Thomas, before completing a medical degree in Cardiff. After training as a general medical practitioner he set up a single-handed practice in the Docklands, the most deprived area of Cardiff, providing medical care to Somali refugees and the homeless as well as to the inhabitants of Butetown. His interest in practice development led to master's degree in medical education and after that to research on shared decision making and [evidence-based medicine]. He completed his PhD thesis under the supervision of Professor Richard Grol in Nijmegen, Netherlands.
He was appointed Professor of Primary Care at the Swansea Medical School (2002–2005) before being appointed Research Professor at Cardiff University. His work examines the implementation of shared decision making, user-centred design of decision support interventions (also known as decision aids) and the integration of these into routine health care. His current focus in on the development, use and impact of Option Grids. In collaboration with Professor Adrian Edwards, he manages a multidisciplinary research group of researchers focused on translating the best available research evidence into clinical practice and by enhancing the patient-clinician encounter (www.decisionlaboratory.com).
Glyn Elwyn has developed the OPTION scale  for measuring the extent that clinicians involve patients in decision making and he co-edits ‘Shared Decision Making in Healthcare: Evidence-based Patient Choice’ 2nd Edition, Oxford University Press 2009.
He co-leads the International Patient Decision Aids Collaboration with Dawn Stacey, which has published quality assessment criteria  and a measurement instrument for tools to support patient participation in decision making.
Glyn Elwyn collaborated in the development of the Normalization Process Theory and has developed the [International Family Practice Maturity Matrix], a method for assessing and benchmarking the quality of primary care organisations.
- Elwyn G, Edwards A, Wensing M, Atwell C, Hood K, Grol R. Fleeting glimpses: measuring shared decision making in primary care using the OPTION instrument. Quality & Safety in Health Care 2003; 12: 93-9.
- Elwyn G, O'Connor A, Stacey D, Volk R, Edwards A, Coulter A, Thomson R, Barratt A, Barry M, Bernstein S, Butow P, Clarke A, Entwistle V, Feldman-Stewart D, Holmes-Rovner M, Llewellyn-Thomas H, Moumjid N, Mulley A, Ruland C, Sepucha K, Sykes A, Whelan T; International Patient Decision Aids Standards (IPDAS) Collaboration. Developing a quality criteria framework for patient decision aids: online international Delphi consensus process. BMJ, 333: 417, 2006.
- Elwyn, G.; O'Connor, A. M.; Bennett, C.; Newcombe, R. G.; Politi, M.; Durand, M. A.; Drake, E.; Joseph-Williams, N.; Khangura, S.; Saarimaki, A.; Sivell, S.; Stiel, M.; Bernstein, S. J.; Col, N.; Coulter, A.; Eden, K.; Härter, M.; Rovner, M. H.; Moumjid, N.; Stacey, D.; Thomson, R.; Whelan, T.; Van Der Weijden, T.; Edwards, A. (2009). Lee, Kirby, ed. "Assessing the Quality of Decision Support Technologies Using the International Patient Decision Aid Standards instrument (IPDASi)". PLoS ONE. 4 (3): e4705. doi:10.1371/journal.pone.0004705. PMC . PMID 19259269.