[5] In 1989, he also took on editorial responsibilities in the German newspaper of New Right Junge Freiheit, and was an author in the far-right journals: Staatsbriefe, Sleipnir, Deutschland in Geschichte und Gegenwart.
[7][non-primary source needed] After his military service with the German Air Force, in October 1990 he joined the Max Planck Institute for Solid State Research at Stuttgart, where he prepared a PhD thesis.
[8] In 1991, Rudolf began work on a paper entitled Report on the formation and verifiability of cyanide compounds in the Auschwitz "gas chambers" on behalf of the Düsseldorf attorney Hajo Herrmann, a former Luftwaffe pilot.
[14] He applied for political asylum, or at least for the right not to be expelled, but this was rejected in November 2004 on the basis that the application had no merits and was a case of frivolous litigation.
Rudolf appealed against this ruling, and in early 2006 the US Federal Court in Atlanta found that his application was not "frivolous", but upheld the decision that it had no merit.
[citation needed] On 15 March 2007, the Mannheim District Court sentenced him to two years and six months in prison for inciting hatred, disparaging the dead, and libel.
[17] In July 2019, Rudolf was arrested near his home in Red Lion, Pennsylvania for "open lewdness" after being found exercising at 4:06 a.m. in a public park "naked from the waist down."
He founded Castle Hill Publishers[19] in 1997[4] based in Hastings, England with Theses & Dissertations Press as its American outlet.
[2] Until his arrest in late 2005, he published the now defunct "Vierteljahreshefte für freie Geschichtsforschung" (Quarterly journal for free historical research), described by the German Office for the Protection of the Constitution as "a right-wing extremist organ.