Mark is an internationally-qualified mountain guide & children's book author. He is a member of both the British and French mountain guides associations. He lives with his wife Jane, their daughters. He works in the European alps all the year and has done so since 1992. Mark's guiding activities are based mainly in France, Switzerland and Italy. Mark works with clients who are committed and passionate about their sports, he strives to find exciting alternatives to the 'gravy-train' routes, that are repetitively trodden across the Alps.
Mark's accomplishments as a professional mountain guide include the first complete unassisted British guided ascent of the Eiger Nordwand with his client Charles Sherwood in 2007. In 2008, Seaton & Sherwood teamed up again to complete a traverse of Mont Blanc via an ascent of Aiguille Blanche de Peuterey, the most difficult 4000-m summit in the Alps. In 1996, Mark led Don Planner, the first blind man to climb Mont Blanc.