Thomas B. Allen (author)

Thomas B. Allen (born 1929) is an American author and historian. He resides in Bethesda, Maryland. He is also the father of science fiction writer Roger MacBride Allen. Allen is a contributing editor to National Geographic. Allen has co-authored numerous books with Norman Polmar. He has also written numerous mystery novels.

His most famous book to date is Possessed. It is a retelling of the true story of a teenage boy (whom Allen identified by the pseudonym Robbie Manheim) from Mt. Rainier, Maryland who went through the rite of exorcism in 1949. Allen tracked down the sole survivor of the team that performed the exorcism, Father Walter Halloran as well as a copy of the diary kept by the team leader, Father William S. Bowdern. It was upon this case William Peter Blatty based the events of his novel, The Exorcist. First published in hardcover in 1993, the book was reissued as a revised paperback in 2000 to coincide with the release of a made-for-cable film Possessed (2000 film) starring Timothy Dalton as Father Bowdern. Since publication of the book, Allen has been a frequent guest on talk shows, entertainment shows and history shows that discuss exorcism in general, demonic possession and the case his book details.

Speaking in 2013, Allen "emphasized that definitive proof that the boy known only as 'Robbie' was possessed by malevolent spirits is unattainable. Maybe he instead suffered from mental illness or sexual abuse — or fabricated the entire experience." According to Allen, Halloran also "expressed his skepticism about potential paranormal events before his death."

Allen's Possessed has been criticized by Mark Opsasnick, who wrote that it contained questionable or inaccurate material, such as misidentifying the location as Mount Rainier, Maryland rather than Cottage City, Maryland.

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