Sir Ranulph Twisleton-Wykeham-Fiennes, also known as Ranulph Fiennes, is a British explorer, adventurer and author. He is the first person to have reached both poles by surface means and the first to cross Antarctica on foot. He has also climbed Mount Everest, completed the longest unsupported polar journey in history, and run seven marathons in seven days on seven continents. He is considered one of the greatest living explorers by the Guinness World Records. Fiennes has written several books about his adventures, including “Living Dangerously” and “Mad, Bad and Dangerous to Know.” He has also served in the British Army, participating in the Omani campaign of the Dhofar Rebellion, and he’s a member of the SAS.