About Us

Since 2012, GlobalLimits had been organizing multi-stage races in Cambodia, Bhutan, Sri Lanka, and Albania. São Tomé is organized in 2020 especially for qualified runners.  Our goal is to combine running with local cultural appreciation – that is, all our race locations have spectacular historical backdrops and there are always opportunities to stay in local homes.   

Our team, including our volunteers and local partners, are experienced runners or event organizers; we have proven track records in organizing successful multi-stage races.

Our professional medical team specializing in wilderness and emergency medicine will provide you necessary high-standard medical treatments during the race week.



Stefan Betzelt/Germany - Founder and General Manager of GlobalLimits

Stefan was born and lives in Wiesbaden/Germany. He founded GlobalLimits in 2012. Stefan has a wealth of extreme racing experience, having participated in many of the most gruelling ultra races, such as Marathon des Sables, Les Foulees de la Soie, Himalayan 100Mile Stage Race, Racing the Planet Namibia and Desert Oman Raid. He also participated in about 20 city-marathons (PB 2:46) and successsfully climbed the Kilimanjaro and the Mount Aconcagua.

Stefan has visited more than 85 countries and learnt a great deal about different cultures and people. He now makes use of this experience to select outstanding and unique locations for the GlobalLimits races.

Stefan has worked as a managing director for some of the leading global financial institutions before he retired in 2004 to become a self employed financial and personnel consultant.

Stefan is also a member of the Curatoship of the Institute of Sports Medicine in Frankfurt/Germany.

Mario Machado, Lisbon/Portugal - Course Director

Mario, a physical Education teacher and international athletic coach, is the technical director of the Lisbon Half Marathon (30.000+ runners), the Portugal Half Marathon, the Lisbon Marathon and the organizer, technical director and controller of the race of various other high profile road races in Portugal and international trail races.

Since 2009 he is also the "Controller of the race" of the Marathon des Sables in Morrocco.

Mario is the publisher and director of "Spiridon-Portugal" running magazin since 1978.

He is also a very experienced runner himself. He just finished his 100th Marathon/Ultra at GlobalLimits Cambodia 2017.

Mario already served as a course director at Albania 2018 and volunteer for the inaugural race in Albania in 2017 and Cambodia 2018. He is also our designated course director for the inaugural race in São Tomé 2020.

Ryan Paterson, Denver/USA - Medical Director

Dr. Ryan Paterson attended the University of Vermont School of Medicine and completed his Emergency Medicine Residency and Fellowship in Wilderness/Altitude/Expedition Medicine at Denver Health Medical Center/University of Colorado. He also holds advanced certifications in Tropical Medicine from the London School of Tropical Medicine and Hygiene (DTM&H) and in Mountain Medicine (DiMM). He is a practicing Emergency Physician for Kaiser Permanente at St Joseph’s Hospital in Denver, Colorado.

Dr. Paterson serves as co-course director for the Wilderness Medical Society and Universities of Colorado and Utah’s Diploma in Mountain Medicine Course (DiMM). He is the current United States delegate to the International Society of Mountain Medicine (ISMM). Currently, Dr. Paterson is working, in partnership with CU South Denver to develop a Wilderness Medicine for Kids program utilizing an original curriculum. He also serves as medical director for No Barriers and another non-profit (Kolkata City Mission) working to establish sustainable development solutions in education, health, women’s empowerment, micro-enterprise and public-health for informal communities in and around Kolkata, India.

Ryan already was our medical director in Cambodia 2016 and Bhutan 2017.

Jennifer Starling/USA - Race Doctor

Dr. Jennifer Starling practices Emergency Medicine for Kaiser Permanente at Saint Joseph Hospital in Denver, Colorado, and is an Adjoint Assistant Professor at the University of Colorado School of Medicine where she teaches wilderness, altitude and travel medicine.  She has a tropical medicine degree from the London School of Hygiene and Tropical Medicine, and a Diploma in Mountain Medicine.  

As a Himalayan Rescue Association volunteer, Jen provided medical care to Everest Base Camp trekkers and local Nepali at a high altitude remote clinic for a trekking season.  

She has worked as race medical for two multi-stage ultramarathons in the American Southwest, and GlobalLimits Cambodia 2015 and Bhutan 2016.  She is excited to return to GlobalLimits for the Albania race! 

Linda Sanders/USA - Race Doctor

Linda  is an Emergency Medicine physician in Colorado.  She completed a Wilderness Medicine fellowship at the Medical College of Georgia during which she finished coursework in Swift water rescue, Avalanche rescue, Search and rescue, and staffed several domestic and international multi stage ultra-marathons. Linda has been an avid runner since high school and this spring she herself completed her first ultra marathon. Linda continues to teach wilderness medicine to students, participates in altitude research and has produced Race Medicine Podcast series for Emergency Physicians.

Linda already served as a race doctor at GlobalLimits Cambodia 2016.

Geert Meese, Tielt/Belgium - Volunteer

Geert is a Belgian medic who decided to work a little bit less and spending  more time doing his passions: multi stage racing ( 100 km del Sahara, Marathon des Sables , Grand to Grand ….) , marathon racing , or volunteering in multi stage races ( Spain, Portugal, Oman …). a passion he sheares with his wife.
If not working or racing , his time is spend abroad with a high preference for unbeaten tracks in Asia or South America.  Always enthusiastic  to help participants to make their dreams come true.

Geert already served as a volunteer for GlobalLimits in Cambodia 2015 + 2016, Bhutan 2016 + 2017 + 2018 and in the inaugural race Albania 2017.

Michael Emett, Hamilton/New Zealand - Volunteer

Mayra Johnson/Brazil - Volunteer

Born and raised in Brazil, living in Asia for the past 17 years, currently in Mumbai (India). Professional background in the Airline Industry and Finance. Currently working in the Fitness Industry as a Pilates Instructor and as an active volunteer at an orphanage for girls in India.

Found the love for running 5 years ago, specifically for the multi stage races. Completed a few full and half marathons and the following a couple of Ultras including GlobalLimits races in Sri Lanka, Cambodia and Bhutan. Mayra is also a winner of the prestigious "GlobalLimits Heritage Site Runner" series award.

Mayra is now really looking forward to join a GlobalLimits race as a volunteer and make use of her very good knowledge of the organization.

Rodrigo Acinas, Spain - Volunteer

Rodrigo was born in Burgos, Spain and is working as a financial controller for companies. 

He is passionate about trail running and road cycling.  Mountains and nature are his favorite playgrounds.

Despite not enjoying competitions as much as he do when training without a goal, he still enroll in demanding mountain races.  The competitive streak needs to be fed!

He always loved the air one breathes in GlobalLimits’ races - He had volunteered in Sri Lanka 2016 and Bhutan 2017 – apart from the physical challenge you meet up with old and new friends. 

"I will try to make everyone feel at east during the race and I will be pleased with my contributions as long as I am helpful to you – to achieve your goal, whatever it is." 



Nertil Dhimitri/Albania - Volunteer

Nertil was born and grown up in Permet/Albania.

He works in Natyral Agency of Natyral Resources(Tirana). In free time he likes running, swiming, hiking etc.

Nertil was already serving as a volunteer for GlobalLimits Albania 2018.

Vladimir Dedndreaj/Albania - Logistics & Infrastructure

Albania Adventure is a specialized and licensed agency in the organization of quality tours with appropriate guides in Trekking, Hiking, Kayak, Diving, Rocky Climbing, Ski Mountaineering, Off Road, Outdoor sports and Extreme adventures, all this thanks to the ground teams and professional guides.

This agency was created in 1998 by Vladimir Dedndreaj, who loves the outdoor life and loves sharing with others his passion and desire of exploring Albania’s beauty, always guided by the spirit of adventure. He was soon joined by other friends, professional guides too. During these years their adventures took them from east to west, from north to south, and they soon would know the inhabitants of the different regions and cultures of the provinces where they stepped. Throughout all these years of exploration, they came to know the Albanian territory better than anyone else. This passion for nature was shared in years with thousands of tourists from around the world, who chose to visit Albania and to live the Albanian adventure.

Throughout the years, Albania Adventure guides are constantly trained and professionalized, this also due to the support and training provided by their European partners. Members of Albania-Adventure are regularly trained in order to be always updated and fully fit. Our guides also speak fluent English, Italian and French. Adventure Albania staff is composed of 8 terrain adventure guides and 3 office operators.