His 1908 survey and map of Mammoth Cave, Kentucky represent the first accurate instrumental survey of portions of the cave system. Kämper arrived at Mammoth Cave during the late 1800s and left in 1909.
Kämper was killed in trench warfare at the Somme River in north-eastern France, on November10, 1916, during the closing days of the Battle of the Somme. He is buried in the War Cemetery of Cambrai near Arras, France.