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 96 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 volunteer for the inaugural race in Albania in 2017 and in Cambodia 2018 as well as being the course director in Albania 2018 and 2019 and Sao Tome 2020 and 2021.

Adri Kasmi, Tirana/Albania - Course Marker

Adri was born in Tirana, Albania. He has finished Bachelor at Sports University of Tirana, Faculty of Movement Sciences and Master of Science at Faculty of Physical Activity and Recreation in field of Physical Activity and Health. After successfully completed his studies, started part time job at Sports University of Tirana as an assistant professor for Outdoor Activities and Winter Sports. Currently he is a tour guide for outdoor activities at Tour Operator Albania Adventure. He also works at Albanian National Olympic Committee, especially in Development Program by Olympic Solidarity for Qualification of Coaches.

He is passionated in hiking, 4WD Off Road driving, mountain biking, ski touring, Kayaking, Stand Up Paddling. In Scuba Diving he has a license as Dive master.

Adri has been the driver of the Course Marking Team at GlobalLimits Albania – The Hidden Treasure for the last 4 years and a volunteer in Sao Tome in 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, Bhutan 2017, 2018, 2019, Albania 2018, 2019, 2020 and Sao Tome 2020 and 2021.

Mafalda Iria, Portugal/Sao Tomé - Volunteer

Mafalda, Portuguese, is a veterinarian at Zuntapata - a lovely veterinary clinic by the sea, in São Tomé and Principe. She arrived in São Tomé in 2017, where she set up her clinic and AMA, an association that works for the safe of street animals, public health and food security.

Her biggest aspirations are her family (of two and four legs), nature and... sport, of course!

For 22 years she practiced ballet and rhythmic gymnastics, until her soul mate instilled her with a new passion: running.

Mafalda was lucky to meet the inspiring GlobalLimits Family in the first race in São Tomé at “The Hemisphere Crossing” in 2020, in which she participated for the first time, as a volunteer as well as in 2021.

Joana Mendes/Portugal - Volunteer

Joana is a kindergarden teacher and a rhythmic gymnastics coach as well.

She discovered São Tomé in March 2021 and started immediately thinking about moving to this beautiful island.

For 23 years she practiced rhythmic gymnastics, and became a coach 7 years ago.

She will participate in the GlobalLimits Sao Tome the second time as a volunteer after 2021.

Tiziano Pisoni/Mucumbli Explore, São Tomé - Logistics & Infrastructure