Technical Experts 

Our teams benefit from advice provided by consultants at the top of their fields, from medicine and mountaineering to safety and water activities

We’ve hired experts with outstanding credentials so you get the best advice available

William Duncan MacKay (Mac) – World Challenge Technical Advisor – Mountain Activities and Safety Management

A former Master at Arms in the Army Physical Training Corps, Mac is an expert in the fields of mountaineering, skiing and outdoor environmental hazards. As MD of Mackay Adventure Consultants, he advises on hazardous activities, adventurous pursuits and sporting activities worldwide, and works closely with specialists in safety management and accident investigation. Mac is also past President of the British Mountain Guides and runs a mountain and ski guiding business, SkiAscent.

His other specialist area is military aspects of adventurous, physical and leadership training for operations and personal protection, incorporating hazardous workplaces. He established the first Ministry of Defence Subject Matter Expert appointment with the Land Accident Investigation Team, providing expert advice during investigations into adventurous training, physical training, sports, environmental hazards and near-miss incidents. He has also provided advice to the Treasury Solicitor and acted as Expert Witness on Board of Inquiries. A vital requirement while in the position was to provide expert advice to commanders and leaders of military adventurous training expeditions worldwide, in particular expeditions categorised as high risk and/or remote in all adventure environments. Mac has also advised the Army’s policy branch on health and safety issues and technical matters relating to adventurous and physical training for operations in general.

Dr Jon Dallimore – Expedition Medical Expert

Jon Dallimore has been advising World Challenge on the medical aspects of expeditions since 1993 and helps write our medical handbooks, used by teams on expedition. He also teaches leaders and World Challenge staff about potential expedition medical problems such as altitude illnesses and cold injuries.

Jon is a General Practitioner and a specialty doctor in the Emergency Department of Bristol Royal Infirmary. His expedition experience started 25 years ago and since then he has spent more than two years living and working in the field as a doctor and/or leader. He has shared his expertise in the deserts of Namibia, Sinai and Northern Kenya; the jungles of Sulawesi, Belize, Thailand and Ecuador; and accompanied high-altitude climbs and treks to Nepal, Greenland, Pakistan, Iceland, Morocco, East Africa and the Andes.

Jon is an International Mountain Leader, a member of the Alpine Club and a member of faculty on the UIAA Diploma in Mountain Medicine. He is also a co-editor of the Oxford Handbook of Expedition and Wilderness Medicine.


Deb Cook – World Challenge Technical Advisor – Water Activities

Deb has spent the last 20 years paddling, with career highlights that include captaining the British Ladies White Water Rafting Team and competing in six World Championships. She has worked in many different countries around the world as a raft or kayak guide, and completed many personal expeditions on rivers around the globe. But she’s equally dynamic out of her kayak as she is in it; she is Chairperson of the English White Water Rafting Committee, UK Representative on the International Rafting Federation Committee and holds a long list of other relevant qualifications. 

Deb works in the outdoor education industry delivering courses to young people and adults, as well as being a Coach Education Tutor for the BCU and a technical advisor within the industry. And having led a number of World Challenge expeditions, she’s the perfect addition to our highly qualified and experienced team.

Project SAFE (Safety Audits for Expeditions)

Safety standards in the developing world often don't compare to what we are accustomed to at home and so World Challenge has developed a comprehensive auditing system to monitor the safety and professionalism of all of our in-country providers. Project SAFE was launched at the beginning of 2013 and is used to screen all pre-booked transport, accommodation and activities. Third-party providers are required to complete a detailed audit questionnaire focusing on the background of their organisation, operational practice, safety record and equipment. Completed audits are analysed by our Safety & Training Team to ensure that the providers we are working with are operating in line with good practice. 

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