Hunter Campbell "Patch" Aams (born May 28, 1945 in Washington, District of Columbia) is an American medical doctor, social activist, citizen diplomat, professional clown, performer, and author. He founded the Gesundheit! Institute in 1972. Each year he organizes a group of volunteers from around the world to travel to Russia as clowns, to bring hope and joy to orphans, patients, and the people. In 1998 he also visited Bosnia, one of the Balkan Peninsula countries torn apart by the war that started after the break-up of Yugoslavia.