Miami Space Transit Planetarium executive director who began hosting the astronomy show Jack Horkheimer: Star Gazer in 1976.
He hosted a WBEV radio show when he was 15 years old.
He volunteered at the Miami Science Museum planetarium in 1964 after moving to Florida to preserve his health.
His father, Arthur Philip Horkheimer, owned a publishing firm and served as the mayor of Randolph, Wisconsin, for 24 years.
Sally Jessy Raphael provided the voice of the solar system on his Child of the Universe show, which played at the planetarium.