A ghostwriter is an author who writes under someone else's name, with their consent. A ghostwriten book is thus somewhat deceptive- the author on the cover is not the actual writer.
Ghostwriters are often employed by celebrities to write autobiographies in situations in which the celebrities themselves may not be talented authors.
... 1991 Leonard Cohen
1992 Ian and Sylvia[?]
1993 Anne Murray
1994 Rush
1995 Buffy Sainte-Marie[?]
1996 David Clayton-Thomas[?]
1996 Denny Doherty[?]
...