NASA astronaut and space scientist who was a part of the Apollo 15 mission. He died in a Mount Everest expedition.
He received his B.A. and M.A. from the University of Virginia before earning a doctorate in astronomy from the University of Michigan in 1954.
He was awarded the NASA Exceptional Scientific Achievement Medal in 1974.
He grew up on a farm in Cincinnati.
A character loosely based off of Karl appeared in the miniseries From the Earth to the Moon, produced by Ron Howard.