About us
Arnold Coster is the founder and senior leader and is probably one of the most senior expedition leaders operating trips in the Himalayas. Arnold started climbing when he was fifteen years old and accumulated a ton of experience climbing numerous peaks and led close to one hundred climbing expeditions in the last two decades.
Safety, Fun & Success are the corner stones of each expedition. Arnold is a relaxed, considerate and thoughtful person; an expert leader and a highly-skilled professional who specializes in getting people to the summit and back down in 100 percent safety. He is a good communicator, a great motivator, has a positive attitude and believes that climbing these High Mountains is achievable for a lot of people; it’s a matter of guidance and support. Arnold is at home in any terrain, with any kind of group. Teaching and sharing his experience is his privilege!
Arnold learned climbing the hard way and knows the sharp edge of the blade. I am not advertising trips with catchy slogans, questionable success rates or encouraging high risks for success. With Arnold you get down to earth leadership based on knowledge from pervious experiences.
Arnold Coster Expeditions is a boutique climbing company operating with small groups to have the best experience and to be able to give each member the leadership they deserve.
To get to know Arnold, just contact him for any kind of question and you will get a honest straightforward answer.
Jenjen Lama was born on 30 September 1992 in Bhotkhola-1, Sankhuwasabha, in Nepal’s remote Makalu region. Raised in the heart of the Himalayas, he developed a deep connection with the mountains from an early age and has since built an outstanding career in high-altitude mountaineering and expedition leadership.
Jenjen serves as Senior Sirdar for Arnold Coster Expeditions & is playing a key leadership role in managing large-scale Himalayan expeditions. He is responsible for overseeing Sherpa teams, coordinating logistics, fixing routes, and ensuring the highest standards of safety and efficiency throughout each expedition. His calm leadership, technical precision, and strong work ethic make him a vital part of the expedition team.
As an NNMGA (Nepal National Mountain Guide Association) certified guide and an IFMGA guide candidate, Jenjen meets international standards of professional mountain guiding. He is also a certified Wilderness First Responder (WFR) and an experienced high-altitude rescuer, providing essential medical and emergency support in extreme environments.
Major Climbing Achievements
Jenjen is Arnold Coster’s main guide and a key pillar of the expedition team. He prepares and organizes all expeditions together with the Sherpa staff, ensuring that every logistical, technical, and safety detail is handled with precision. During the off-season, he trains the climbing staff to maintain high professional standards and strong team performance. A strong Sherpa leader is just as important as leading the members themselves, and Jenjen’s leadership, responsibility, and experience are fundamental to the success of every expedition.
With deep Himalayan roots, technical mastery, and proven leadership under extreme conditions, Jenjen Lama remains an essential part of the Arnold Coster guiding team, dedicated to delivering safe, professional, and world-class Himalayan expeditions.
Instagram: https://www.instagram.com/jenjen_lama?igsh=Mjg0MmkxdjFxa2dx&utm_source=qr
Facebook: https://www.facebook.com/Lamajenjen?mibextid=wwXIfr&mibextid=wwXIfr
Our team is made up of highly motivated and dedicated mountain guides who take great pride in their work. At Arnold Coster Expeditions, we are committed to maintaining the highest standards of safety and professionalism, which is why we ensure our guides receive training before every season to refresh and strengthen their skills.
Their experience, passion, and commitment are at the heart of everything we do. We are incredibly proud to have such a strong and reliable support team, whose expertise and dedication help make every expedition safe, successful, and memorable.
Maximo Kausch is one of the world’s most accomplished high-altitude mountaineers, with over 25 years of climbing experience and more than 118 expeditions led across the Andes, Himalayas, and beyond. Born in Argentina, raised in Brazil, and educated in the UK, he has been guiding professionally since the age of 23.
Recognized by Guinness World Records, he holds the record for the most 6,000-meter peaks climbed, including 90 in the Andes, and has summited over 260 peaks above 5,500 meters. He has also taken part in multiple expeditions to 8,000-meter peaks, including K2.
Maximo is the founder of Andes Specialists and the Andes 6K+ Project, having completed 85% of his goal to climb all 104 Andean peaks above 6,000 meters.
At Arnold Coster Expeditions, we are proud to regard him as a true South America expert. Known for his calm approach and meticulous planning, he prioritizes safety and proper acclimatization in every expedition.
Arnold learned climbing the hard way and knows the sharp edge of the blade. I am not advertising trips with catchy slogans, questionable success rates or encouraging high risks for success. With Arnold you get down to earth leadership based on knowledge from pervious experiences.
Arnold Coster Expeditions is a boutique climbing company operating with small groups to have the best experience and to be able to give each member the leadership they deserve.
To get to know Arnold, just contact him for any kind of question and you will get a honest straightforward answer.
Jenjen serves as Senior Sirdar for Arnold Coster Expeditions & is playing a key leadership role in managing large-scale Himalayan expeditions. He is responsible for overseeing Sherpa teams, coordinating logistics, fixing routes, and ensuring the highest standards of safety and efficiency throughout each expedition. His calm leadership, technical precision, and strong work ethic make him a vital part of the expedition team.
As an NNMGA (Nepal National Mountain Guide Association) certified guide and an IFMGA guide candidate, Jenjen meets international standards of professional mountain guiding. He is also a certified Wilderness First Responder (WFR) and an experienced high-altitude rescuer, providing essential medical and emergency support in extreme environments.
Major Climbing Achievements
Jenjen is Arnold Coster’s main guide and a key pillar of the expedition team. He prepares and organizes all expeditions together with the Sherpa staff, ensuring that every logistical, technical, and safety detail is handled with precision. During the off-season, he trains the climbing staff to maintain high professional standards and strong team performance. A strong Sherpa leader is just as important as leading the members themselves, and Jenjen’s leadership, responsibility, and experience are fundamental to the success of every expedition.
With deep Himalayan roots, technical mastery, and proven leadership under extreme conditions, Jenjen Lama remains an essential part of the Arnold Coster guiding team, dedicated to delivering safe, professional, and world-class Himalayan expeditions.
Instagram: https://www.instagram.com/jenjen_lama?igsh=Mjg0MmkxdjFxa2dx&utm_source=qr
Facebook: https://www.facebook.com/Lamajenjen?mibextid=wwXIfr&mibextid=wwXIfr
Their experience, passion, and commitment are at the heart of everything we do. We are incredibly proud to have such a strong and reliable support team, whose expertise and dedication help make every expedition safe, successful, and memorable.
Maximo is the founder of Andes Specialists and the Andes 6K+ Project, having completed 85% of his goal to climb all 104 Andean peaks above 6,000 meters.
At Arnold Coster Expeditions, we are proud to regard him as a true South America expert. Known for his calm approach and meticulous planning, he prioritizes safety and proper acclimatization in every expedition.
