Schadewald was the last person to interview Immanuel Velikovsky, the interview occurred six days before Velikovsky's death in 1979. Schadewald was preparing an article on Velikovsky to be published on the 30 year anniversary of the publication of Velikovsky's best seller Worlds in Collision (The MacMillan Company, New York, 1950). The interview can be accessed in the original article in FATE magazine,"Velikovsky: The Last Interview," Fate, May 1980, pp. 80–89. or in the collection of Schadewald's writings Worlds of Their Own (Xlibris, Philadelphia, 2008).
