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I am a British doctor and mountaineer living and working on the edge of Snowdonia National Park, Wales.

I am an Emergency Medicine Doctor and Expedition Doctor with a special interest in trekking and mountaineering in high altitude mountain environments.

Personal Travel & Mountaineering

I am very fortunate to have grown up on the edge of the Peak District with parents who introduced my brother and I to the outdoors as young children, regularly taking us hill walking, rock climbing, cycling, camping and skiing. I have a particular fondness for the French Alps where my Dad, who was an excellent climber, introduced me to Alpine mountaineering over a decade ago. Since then I have worked, travelled and climbed in thirty countries across six continents, from solo adventures in the Brazilian Amazon rainforest, trekking in the Bolivian Andes and the Nepal Himalaya, to ski touring in the Swiss Alps and winter climbing in Scotland.

I’ve held the Summer Mountain Leader award since 2014 and led walks and scrambles for groups whilst at university.

These days you can usually find me playing in my local mountains and lakes of Snowdonia, usually accompanied by my partner, Tom and our dog, Dylan.

Medical Background

I graduated from the University of Leeds with a BSc Honours in Chemistry before graduating in Medicine from the University of Warwick in 2016. During my medical degree I spent six weeks working in India in the contrasting settings of a large, private hospital in Delhi followed by a mobile clinic providing much needed basic health care resources to communities in remote mountain villages.

I later gained postgraduate training by completing the UIAA Diploma in Mountain Medicine, a demanding year-long programme teaching and assessing the theoretical and practical knowledge of illnesses and injuries occurring in the mountain environment. Assessment included winter and Alpine mountaineering skills, tested in Scotland and the Swiss Alps respectively.

I worked at Ysbyty Gwynedd (Bangor hospital) from 2016 to 2021 gaining experience in a range of specialties including Acute Medicine, General Surgery, Intensive Care, Paediatrics and Psychiatry. This time also included working in Emergency Medicine (EM) for almost two years where I loved working in the busy emergency department treating patients presenting with everything from mountain trauma to heart attacks, sepsis to jelly fish stings! 

I completed 18 months of General Practice training before resigning in January 2022 to go back to Emergency Medicine where my passion lies. I now love balancing my work in the emergency department with my mountain medicine teaching and expedition work. My aim is to work as a Staff Grade EM doctor.

Event & Expedition Medicine

I began providing medical cover for UK based ultra marathon trail events in 2015 and went on to cover mountain marathons as far afield as the Nepal Himalaya. In the last few years I have focused on supporting groups on remote, high altitude trekking and mountaineering expeditions. I thrive on empowering people to push their limits whilst providing them with the reassurance of experienced medical back-up.

I have experience in independently managing casualties with Acute Mountain Sickness (AMS) and organising the evacuation and treatment of casualties with suspected High Altitude Cerebral Oedema (HACE) and High Altitude Pulmonary Oedema (HAPE), from remote and hostile environments.

I am passionate about sharing mountain medicine knowledge to expedition members. Whenever possible on expedition I give informal tutorial style talks on topics such as Altitude Physiology and Illness, Hypothermia and Heat Illness. I enjoy tailoring the information to the group and promoting discussion.

I am available for international expedition work – please get in touch if you’re looking for a doctor for your expedition team.


I am passionate about teaching mountain medicine and can provide tailored lectures and interactive workshops for students, medical professionals, outdoor professionals and outdoor enthusiasts. 

I am part of the teaching faculty for the University of Central Lancashire Diploma in Mountain Medicine, teaching on two of the modules with specialist subjects including considerations for Women Travelling to Altitude, Acclimatisation, Altitude Illness, Managing Chronic Disease at Altitude and Mountain Trauma.

I have joined the World Extreme Medicine (WEM) faculty and will be teaching on expedition and wilderness medicine courses from 2022.

I was part of the teaching faculty at the 2019 BMC/BMMS (British Mountaineering Council/British Mountain Medicine Society) Mountain Medicine Weekend. I ran workshops for non-medics (many of whom were outdoor professionals) on both Primary Survey for Casualty Assessment and Hypothermia Management. 

I have delivered talks and workshops on a range of mountain medicine topics for various walking and climbing groups as well as student wilderness medical societies.

I am available for talks and workshops – please get in touch if you’re interested in organising a session.


I am a member of the Birmingham Medical Research and Expeditionary Society (BMRES), an active and influential group in altitude medicine research that has published over 200 articles since 1976. I have participated on altitude research expeditions in Ecuador and India with the BMRES in which I was both research assistant and study participant, gaining data on the effects of altitude on human physiology. In Ecuador I also designed and ran a study evaluating the effects of ascent to high altitude on cognitive function.

Our next expedition is planned for October 2022 to the Annapurna region of Nepal. 

  • Nocturnal Saturation Variance Is Related To Lake Louise Scores During Ascent To 4,800 metres. Kelsey E. Joyce, John Delamere, Chris Bradley, Kimberly Ashdown, Rebekah A.I. Lucas, Owen Thomas, Hannah Lock, Will Malein, Abigail Letchford, Arthur R. Bradwell, Samuel J.E. Lucas, and Birmingham Medical Research Expeditionary Society, High Altitude Medicine & Biology: 13 Dec 2021, Volume 22, Issue 4 Online:
  • Nocturnal oxygen saturation is related to increased urinary alpha-1 acid glycoprotein during ascent to 4,800 metres. Joyce KE, Delamere J, Ashdown K, Bradley C, Lucas RAI, Thomas O, Lock H, Talks B, Malein W, Lewis CT, Cross A, Letchford A, Bradwell AR, Lucas SJE. 2020. Conference: 25th Anniversary Congress European College of Sport Science. 265.
  • Proceedings of BMRES Altitude Medicine Conference: November 26th, 2016, Birmingham, United Kingdom. Lauren E Gault, Christopher T Lewis, Hannah E Lock. High Altitude Medicine & Biology: DOI: 10.1089/ham.2016.0146
  • Evaluation of Cognitive Function at Altitude Using the King-Devick Test. Hannah E Lock, Christopher HE Imray and Owen Thomas. Poster Presentation: BMRES Altitude Research Conference. Eds: Bradwell AR and Wright AD. 2016: p11.
  • Journey from the Centre of the Earth. Christopher Imray and Hannah Lock. Chimborazo: The Adventure Medic. March 2016.