Clinical team

If you would like to contact any of the individuals listed below, please contact the JAG office by email at

You can also read about the JAG office team here.

Dr Mark Coleman

Chair of JAG

Mark has been a colorectal surgeon in Plymouth since 2001. He led Lapco, the national training programme for laparoscopic colorectal surgery in England, transforming the uptake of this procedure nationally and internationally. He is founder and chair of Bowel Cancer West which supports training, research and awareness across south-west England and Wales. He chaired the external affairs committee at the Association of Coloproctology (ACP) from 2011-2016 where he led the redevelopment of the ACP website and the creation of a YouTube channel for the journal Colorectal Diseases.

Dr Chris Healey

Chair of JAG accreditation

Chris trained in medicine in Sheffield and graduated with honours in 1987, including a distinction in surgery and psychiatry. In 1998, Christopher worked as a senior registrar in Cambridge before accepting his current post in 1988 as a consultant gastroenterologist in Keighley, West Yorkshire. Since 2007, Chris has taken part in general medicine and has since become a NHS bowel cancer screeing programme colonoscopist, before joining the JAG team as an assessor in 2009. He became chair of JAG accreditation in 2019.


Dr Geoff Smith 

Chair of JAG training

Geoff is a luminal gastroenterologist at Imperial College Healthcare NHS Trust in west London. He has been a screening colonoscopist for over 10 years and is faculty on colonoscopy training courses at St George’s Hospital. He is also deputy postgraduate dean for North West London, chair of the exam board for the European Specialty Examination in Gastroenterology and Hepatology, and chair of the bowel cancer screening multiple choice questions (MCQ) group. His academic interests focus on cognitive load in skills training and the development of training systems for complex medical interactions such as ward rounds. 

Debbie Johnston

Head assessor for accreditation

Debbie is the head assessor, providing expert leadership to over 30 assessors, ensuring consistent application of the JAG standards, and assessments of the highest possible quality. She has over 30 years’ experience in healthcare in nursing, managerial, quality improvement and quality assurance roles, and has played a key role in the development of JAG accreditation since its establishment in 1994.

Photo of Debbie Johnston

 Sarah Marshall 

JAG Nurse Lead

Sarah has a wide range of experience from medical assessment wards, A&E, ITU and as a resuscitation officer. She has been involved in endoscopy for almost 20 years working as an endoscopy nurse and senior sister before setting up the bowel cancer screening centre at St. Mark’s Hospital in 2006. She is the clinical programme manager and oversees the operational and clinical management in the screening centre for North West London whilst remaining engaged as an SSP too. She has been part of the BSG nursing committee since 2019.


Richard Robinson

Chair of bowel cancer screening programme (BCSP) accreditation panel

Richard is the chair of the BCSP accreditation panel, having been a bowel cancer screening colonoscopist for over 10 years. He has a long-standing interest in endoscopy training and assessment having established Leicester as a JAG training centre in 2004 and more recently as an accreditation centre for both BowelScope and bowel cancer screening. He is clinical director of the University of Leicester Hospitals bowel cancer screening service. In 2014, he established the Ghana Endoscopy Project and with colleagues has regularly taught training the trainer colonoscopy courses and basic endoscopic skills courses in Ghana.

Professor Matt Rutter

Chair of the National Endoscopy Database (NED) working group

Matt is professor of gastroenterology at Durham University, specialising in advanced diagnostic colonoscopy, polypectomy and IBD.

Photo of Matt Rutter

Dr James East

Chair of the JAG research committee

James is a gastroenterology and clinical lead at Oxford University Hospitals and is also the director for the Oxfordshire bowel cancer screening programme.


Phedra Dodds

JETS Workforce lead

Phedra has been chair of the Welsh Endoscopy Nurse Training faculty since 2015 and has focused on quality improvement as part of the national endoscopy team where she was lead nurse from 2002-2015. Phedra is responsible for providing leadership and direction for JETS Workforce and leads on the implementation of competency framework and training packages.

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