Britton Keeshan (born December 1, 1981) is one of the youngest people to climb the tallest mountains on all seven continents in a feat known as the Seven Summits. He accomplished this feat on May 24, 2004, when he successfully summited Mount Everest at the age of 22 years and 179 days old. Keeshan held the record until June 2005 and is now listed as fourth on the list.
Keeshan is the grandson of Bob Keeshan, the children's performer better known as Captain Kangaroo. He had a close relationship with his grandfather, buring a photo of the two of them at the summit of Mount Everest.
Keeshan is a graduate of Phillips Academy, Middlebury College, Dartmouth College, and the University of Vermont College of Medicine. He completed his pediatric residency at the Children's Hospital of Philadelphia and his Pediatric Cardiology fellowship at Seattle Children's Hospital. As of 2019, he is an Assistant Professor of Pediatric Cardiology at Yale.