Roelof Hendrik "Rob" Nanninga[1] (6 August 1955 – 30 May 2014) was a Dutch skeptic, writer, board member of Stichting Skepsis and editor of its magazine Skepter.

[1] Nanninga was a teacher for only a short time, being unable to keep order in class; his East Groningen pupils wanted no part of his Skinnerian ideas about rewarding and not punishing.

The test subject, who beforehand claimed that the meditation gave him a "flying feeling", was confronted with the hard truth that one cannot push oneself off of a rolling plate.

[3][6] At the end of 1987, Rob Nanninga was among 25 Dutch Skeptical Inquirer subscribers who convened at the Humanistisch Verbond in Utrecht, with Paul Kurtz present, to found a CSICOP-like organisation in the Netherlands, which led to Stichting Skepsis.

Nanninga then spoke to several former clients, students and therapists of the IVG, after which he sent a report with his findings to the director of the social service and the chief inspector of Healthcare in January 1995.

With her 'sect' in the city centre of Groningen she 'terrorised the neighbourhood', on the one hand by manipulating her own coworkers with threats and drumming into their minds that they had been the victims of various "repressed" crimes in the past, including sexual and ritual abuse.

[10] After the publication of Nanninga's piece, the GGD and social service decided not to refer new clients to the IVG for the time being, and several more ex-students came out with complaints.

[8][14] Around the turn of the millennium, a wave of pseudoscientific interest for extraterrestrial life and its supposed connection to crop circles and UFOs kept Nanninga and his colleagues (especially Marcel Hulspas) busy.

[18][19] In the summer of 1999, Nanninga concluded that crop circles had been shown to be hoaxes so many times and that their popularity was clearly waning, and that further serious investigation had become unnecessary, although he could see a future for it in art.

[20] In April 1997, Nanninga investigated and described the rise and fall of the American Christian-ufological Heaven's Gate sect, and what had driven its members to commit cult suicide.

[24][25] After the remarks of the Dutch Minister of Health Hans Hoogervorst on 18 February 2004 that homeopathy is 'just water', and that following the KNMG report on the death of Sylvia Millecam, he intended to henceforth legally prohibit anyone but physicians from medically diagnosing patients,[26] homeopaths reacted furiously.

Nanninga again repeated the rules that had been mutually agreed upon, and clarified the conditions that should indicate that the test results would be reliable, and remained open for the challenge, but warned the NVKH that it should retract its claims against Minister Hoogervorst if it pulled out definitively.

[31][32][33] In 2005, Nanninga exposed the self-proclaimed psychic Robbert van den Broeke, who in the RTL 4 TV show Er is zoveel meer ("There is so much more") claimed to be able to paranormally contact the ancestors of people present, but had actually drawn his information directly from a genealogy website, including a linguistic error that he had copied: genverbrander instead of geneverbrander, an old-fashioned spelling of jeneverbrander, literally translating in "gene burner", but meant was "gin burner".

The psychic sought contact with Arno and ended his story with the text: However, Nanninga noticed that most of this information could be found precisely on the Internet.

[40] On 29 December, RTL said it still believed in the self-proclaimed medium,[41] while Van den Broeke stood up for himself, claiming that "Heaven above" had revealed to him that Er is zoveel meer would be continued with a new series of episodes.

[43] Back in 2006, Nanninga had written an article that was critical about Facilitated Communication (FC), with which handicapped people could allegedly speak by pointing out letters on a board, guided by a helping hand.

[46][47][48] Nanninga was also critical of astrology,[49][50] acupuncture,[51] deprogramming,[52] the "occult" personality course Human Dynamics,[53][54] The Next Uri Geller,[55] Het Zesde Zintuig,[56] endtime predictions because of the supposed Maya calendar's end in 2012[57] and pseudoscientific HRM methods such as the enneagram.