 He was also co-founder and editor of "Fidelio", the magazine of the Schiller Institute, a LaRouche movement think-tank founded by Helga Zepp-LaRouche.Kronberg died after jumping from a highway overpass on April 11, 2007, in what a spokesman for the Loudoun County Sheriff's Office said was an apparent suicide—the cause of death also recorded on the death certificate.Kronberg was born in the Bronx, New York.