International Mountain Climbing School - Ice climbing, rock climbing, and mountaineering instruction and guiding. Operates internationally. (North Conway, New Hampshire)

Himalayan Experience - Guided expeditions of Everest, Ama Dablam, Cho Oyo, and Shishapangma. (London, United Kingdom)

Expeditions International - Offering international expeditions as well as climbing instruction and guiding for rock climbing and ice climbing. (Boulder, Colorado)

Adventure Consultants - Mountaineering expeditions and treks to the Himalaya, Antarctica and South America. (Wanaka, New Zealand)

Venture Forth Mountain Guides and Instructors - Mountaineering adventures, ropes course construction, and mountaineering skills courses in Southern Africa, North America, and Thailand. (Cape Town, South Africa)

Adventures International - Mountaineering expeditions, private guiding and scheduled tours. Operates internationally. (Hood River, Oregon)

Sierra Wilderness Seminars - Mountaineering school offering courses and climbs in California and South America. (Mount Shasta, California)

Southwest Adventures - Mountaineering school and guide service with expeditions in South America, Africa, and the United States. (Durango, Colorado)

American Alpine Institute - Ice climbing, rock climbing, and mountaineering instruction. Operates in Washington, Colorado, California, Nevada, Alaska, France, Switzerland, Bolivia, Mexico, Ecuador, Argentina, Chile, and Nepal. (Bellingham, Washington)

Queenstown Mountain Guiding - Mountaineering, ice climbing, rock climbing, and heli-skiing guiding and instruction. Operates in the southern Alps of New Zealand. (Queenstown, New Zealand)

Canadian Himalayan Treks - Trekking and mountaineering courses and expeditions. (Squamish, British Columbia)

Ascensions - Guided ice climbing, off piste skiing, mountaineering, and expeditions to Switzerland, Austria, Italy, Canada, China, Alaska, Nepal, Bolivia and Peru. (Chamonix , France)

Australian School of Mountaineering - Offering private guiding and instruction in rock climbing, mountaineering, and canyoneering as well as courses in rescue, navigation, and survival. (Katoomba, Australia)

Patagonicas - Guiding at mountaineering destinations worldwide. Information on destinations, guide qualifications, and book sales. (Jackson Hole, Wyoming)

International School of Mountaineering - Ice climbing and mountaineering instruction. (Leysin, Switzerland)

Esprit Montagne - Offering rock, alpine, and ski mountaineering guiding. Operating in the Aosta Valley and on select mountains around the world. (Aosta, Italy)

International Mountain Guides - Mountaineering guiding on peaks worldwide. Information on the Mallory and Irvine Everest Expedition. (Ashford, Washington)

Leading Edge - Trekking, mountaineering, and climbing expeditions to Aconcagua, Kilimanjaro, High Atlas, Huayhuash, and Alpamayo. (Cumbria, United Kingdom)

Chamonix Alpine Adventures - Rock, alpine, and ski mountaineering instruction and guided ascents in France, Italy and the USA (Chamonix, France)

Alpine World Adventures - Guided trekking, mountaineering, and climbing expeditions to Nepal, Europe, and South America. (Boulder, Colorado)

OnTop - Mountain guiding in Colorado, Canada, and Europe. Information on programs and private guiding. (Fort Collins, Colorado)

Cosley and Houston Alpine Guides - Rock climbing, ice climbing, and mountaineering guiding and instruction. Offers special programs for the deaf. Operates internationally. (Bishop, California)

Jagged Globe - Guided expeditions to the seven summits. Winter climbing courses in Scotland and ice climbing courses in Canada. (Bristol, United Kingdom)

Mountain Madness - Mountaineering instruction and guiding. Operates internationally. (Seattle, Washington)

Mountain Recreation - Mountaineering instruction and guiding. Operates on Mount Cook, Mount Aspiring, and Mount French. (Wanaka, New Zealand)

Wee's Rock Climbing School - Rock climbing instruction and local information. (Railae, Thailand)

Mountain Skills - Rock climbing and mountaineering instruction. Operates in Taos, New Mexico; the Gunks, New York; Red Rocks, Nevada; Mexico and Thailand. (Arroyo Seco, New Mexico)

Independent Mountain Guides - Rock climbing, mountaineering, and ice climbing instruction and guiding. (Queensland, New Zealand)

High Country Expeditions - Mountaineering guiding and instruction. Operates internationally. (Twizel, New Zealand)

Grampians Mountain Adventure Company - Rock climbing guiding and instruction. Operates in the Grampians and Mount Arapiles. (Australia)

Alpine Ascents International - Mountaineering instruction and guided expeditions to the seven summits. Operates internationally. (Seattle, Washington)

Destination Africa Tours - Guided expeditions of Mount Kilimanjaro. (Pretoria, South Africa)

Guiding Light Mountain Guides - Guiding for mountaineering and rock climbing. Operates internationally. (Leeds, United Kingdom)

Ang Rita Trek and Expedition - Organizes trekking, peak climbing, and Everest expeditions in Nepal and Tibet. (Kathmandu, Nepal)

Nature Bound - Rock climbing, abseiling and caving instructors. (Victoria, Australia)

Peak High - Climbing and mountaineering courses and expeditions in South Africa.

Summit Expeditions International - Guided mountaineering expeditions to the European Alps; Mount Kilimanjaro, Africa; Mount Kenya, Africa; Mount Aconcagua, Argentina; and the Mexican volcanoes. (Seattle, Washington)

Malta Rock Climbing - Rock climbing instruction and guiding. (Birkirkara, Malta)