Vanessa O’Brien is a British and American mountaineer, explorer, public speaker, and former business executive. As a result of her dual nationality, she became the first American and British woman to successfully summit K2 on July 28, 2017 when, on her third attempt, she successfully led a team of twelve members to the summit and back. In 2018, she received Explorer of the Year from the Scientific Exploration Society for her efforts. In 2022, Vanessa became the first woman to reach extremes on land, sea, and air, completing the Explorers’ Extreme Trifecta after passing the Kármán line on Blue Origin’s sixth human spaceflight, NS-22. She is a Fellow of the Royal Geographical Society and a member of the Scientific Exploration Society (SES).

Vanessa O'Brien is an American mountaineer and a British mountaineer (as a result of her dual nationality), explorer, public speaker and former business executive. Vanessa was named Explorer of the Year in 2018 by the Scientific Exploration Society. She is one of only eight women to achieve the Explorers Grand Slam, having summited the highest peak on every continent and skied the last degree to the North and South Poles in eleven months. Vanessa was the first woman to set a speed record to climb the Seven Summits, entering the Guinness Book of World Records for climbing the Seven Summits in 295 days. Curiosity, determination and a passion for excellence led her to become the first American woman and the first British woman to successfully summit K2 in 2017. Vanessa is a Fellow of the Royal Geographic Society and a Member of the Scientific and Exploration Society.  She is an advocate for woman's causes, carrying the UN Women's flag to the summit of K2. She lives in New York City and London with her husband, Jonathan.