Michael Kurtz's STOCKHAUSEN: A Biography was first published in German in 1988. This English translation by Richard Toop appeared in 1992, and includes a few brief remarks on events which occured between the two editions. The book is emphatically a biography, for while it is understood that one can best describe the composer's life by the works he turns out, there is little heavy analysis of Karlheinz Stockhausen's music. In fact, it's almost as musicologically lightweight as Toop's biography of Ligeti, though it is illustrated not only with photos but also with many samples from the scores.
After a preface that vaguely descibes the mature Stockhausen's long writing of his opera LICHT (which was finally completed years after this biography appeared), we start with Stockhausen's birth. The history of his family and the interesting landscape of his ancestral lands is presented and, while coverage of Stockhausen's childhood and adolescent is limited, the reader learns how the young man first wrote a variety of literary works before deciding to become a composer.
Most of the book covers the period 1951-1975. We meet first the Darmstadt serialist, and see him become a electronic wizard. Entering the 1960s, Kurtz tracks Stockhausen's impressive world travels, including frequent visits to the U.S. and a highly significant first visit to Asia. The formation of the Stockausen Ensemble and its notable performances in a Lebanon cave and at the Osaka World Fair get detailed examination. Along the way, there are a few references to Stockhausen's personal life, such as his marriage to Doris Stockhausen, followed by his relationship with Mary Bauermeister and eventual parting. Kurtz never outright judges Stockhausen to have become an increasingly eccentric and bizarre figure, but enough details are there that the reader can understand why critics many feel this way.
One major downside of the work is the skimpy coverage of Stockhausen's life after the middle of the 1970s. Granted, Stockhausen had ceased to grant many interviews at this time, and was working with an intimate circle of family and close friends who aren't too talkative, so these decades would be a challenge for a biographer. But there's not even much talk of the musical output. We're repeatedly told that the LICHT cycle is a significant piece of work, but details about the operas complete up until that point are missing.
And while we see Stockhausen's place in the wider Darmstadt circle in the 1950s, there seems little attempt to place him in a larger context afterward. For example, the German composer was not the only one to turn to astral mysticism in 1968, as Per Norgard in Denmark did the same, but there's no such discussion of such trends. Stockhausen's close friendship with Boulez in the 1950s is mentioned, but the reader does not find out how the two men viewed each other in later decades.
If you are looking for serious analysis of Stockhausen's music, Robin Maconie's OTHER PLANETS is the book to get. Kurtz's biography is a good resource for anyone wanting a short overview of this highly influential and eccentric composer's life, in spite of its faults.