Professional ratings
Review scores
Source	Rating
Allmusic
Chicago Tribune	(average)
Robert Christgau	B
Entertainment Weekly	B-
Melody Maker
NME	(7/10)
Pitchfork Media	(3.3/10)
Q
Rolling Stone
Spin	(8/10)

The Unauthorized Biography of Reinhold Messner is the third studio album by Ben Folds Five, released April 27, 1999. It was their last studio album before breaking up in 2000.

The title of the album refers to a name used by the band's drummer Darren Jessee and his friends on fake IDs as teenagers. The band was unaware of the existence of the real Reinhold Messner, the first man to climb Mount Everest solo, and the first to do so without the aid of bottled oxygen, until work on the album had already progressed. They were informed of his existence in 1999 during an interview with DJ Bruce Warren of WXPN radio. In the record's liner notes, Messner is thanked for his understanding and cooperation. He later contacted the band to let them know that he was highly pleased with the album.

Originally, "Don't Change Your Plans" was preceded by a long instrumental passage; Folds credits producer Caleb Southern for helping edit down the song to its final product, and told an interviewer that Southern, "just cut it away and then all of a sudden it was this pop song. And then it was like ‘Oh okay. I see what you’re talking about.’ Cause I didn’t hear it like that at all. I just heard it as this little masterpiece thing.” On the Ben Folds iTunes Originals, Folds explains that the song "Mess" is a "loss of innocence song" about having so much baggage that now you are unable to completely explain your history; "you've made a mess."

The hospital referred to in "Hospital Song" is a real hospital: Forsyth Medical Center, located on Silas Creek Parkway in Winston-Salem, North Carolina.

The vocal portion of "Your Most Valuable Possession" consists of a message left on Folds' answering machine by his father, Dean Folds, while he was partially asleep.

Folds stated in the iTunes Originals interview about the album: "The 'Reinhold Messner' record was – I think in a way it shows how naïve we were, and idealistic we were as a band to think the music business would care about us extending ourselves and developing and being something different, because that record was a failure – in almost every way that you can fail. As a commercial release, it didn’t sell up to anybody’s expectations; critically, it got sort of lukewarm reviews; and yet, I think that was our best work. I think it’s a great record."

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