Tommy John, for whom the famous elbow surgery is named, and his son Tommy John III, a chiropractor, have been conducting speaking engagements about the increasing number of stressed elbows of young pitchers.
The elder John pitched for 26 seasons in the major leagues, compiling a record of 288-231. His career was able to be extended due to a surgery performed by Dr. Frank Jobe in 1974. The medical procedure eventually became the standard for repairing elbow injuries suffered by baseball pitchers.
The younger John was a pitcher himself in college and played for two seasons in independent league baseball.
Read more about Tommy John and his son at the link below from San Diego Union Tribune: