If there were a Guinness world record for making telescope mirrors, Dean Ketelsen would likely win it. Colleagues boast that the onetime Iowa farm boy has ground and polished more square footage of optics than any human being alive.
In the University of Arizona's Steward Observatory Mirror Lab, he's now working on the mirrors for one of a new generation of super-large, ground-based telescopes being constructed around the world. The Giant Magellan's 80-foot-diameter light-gathering area will dwarf the largest telescopes in the world.
Full story from the Los Angeles Times
Steward Observatory Mirror Lab website