He was a research fellow at the Institute of Parapsychology in Durham, N. C. 1969–70 and did an internship in clinical psychology at the Department of Psychiatry, University of Virginia in Charlottesville, 1970–71.
[14] His 2005 book Látnir í heimi lifenda (English translation The Departed Among the Living, 2012) describes surveys and follow-up investigations he conducted into alleged apparitions and related phenomena in Iceland.
[17] According to Terence Hines: Osis and Haraldsson's (1977) study was based on replies received from ten thousand questionnaires sent to doctors and nurses in the United States and India.
This means they had passed through two highly fallible and constructive human memory systems (the doctor's or nurse's and the actual patient's) before reaching Osis and Haraldsson.
[24] Philosopher Paul Edwards noted how Erlendur did not come to any definite conclusion about the authenticity of Baba's miracles but regarded fraud as unlikely.
[25] Psychologist Janak Pandey wrote that Erlendur was impressed by Baba but could not get him to produce any paranormal phenomena under controlled conditions.
[27] Daniel Bassuk Professor of Religious Studies at the University of South Florida wrote "Haraldsson and Osis conclude that they were unable to detect any evidence of fraud, and were led to regard Satya Sai Baba's materializations as 'possibly paranormal'.
[31][32] In 2012 with Hafliði Helgason, he published a memoir, Á vit hins ókunna, in which he discussed the results of his interviews with children who believe they recall past lives.