LARGO, Fla. — To parents with younger kids, Jack Hartmann is a household name. The 71-year-old has written and recorded over 1,500 children’s music videos. “I've always been fascinated and ...

PINELLAS COUNTY, Fla. — When you sit behind the scenes watching Jack Hartmann make his nearly 1,800th YouTube video, you quickly realize why the children’s educational, singing sensation has ...