Here’s an excellent article on one of the greatest American gymnasts all time.
A longtime Nebraska assistant coach under Francis Allen and now Chuck Chmelka, his prep and collegiate teammate, Hartung helped lead Nebraska to four consecutive national team gymnastics championships in 1979-80-81-82. …
He’s a cancer survivor.
“I was judging the World Gymnastics Championships in Belgium in 2010,” he told me. “I wore a tie all day, and when I took it off, I rubbed my neck and found a bump. I remember thinking ‘I don’t have a sore throat. I don’t have a cold.’ I just had an ominous feeling from that moment to the rest of the trip. When I got back to Lincoln, I saw a doctor the next morning. I was diagnosed with a type of throat cancer that was right behind my voice box.”
Gymnastics Coaching.com 