Georg Nikolaus von Nissen

• 1. Introduction

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  Georg Nikolaus von Nissen's tombstone in Salzburg does not mention his diplomatic career or his years of research. It calls him simply "The husband of Mozart's widow." That inscription captures the central tension of his life. He was a Danish civil servant who arrived in Vienna in 1793, met Mozart's widow four years later as her tenant, and ended up spending his final years building what became one of the first serious biographies of Wolfgang Amadeus Mozart. He died before it was finished. The book was completed by someone else and is still described by scholars as problematic. Yet it remains a source that researchers consult today. What made the biography worth consulting despite its flaws? And how much of what went wrong was actually Nissen's doing?

• 2. From Post Office to Foreign Service

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  Nissen was born in Haderslev on the 22nd of January 1761, in what was then Denmark-Norway. He completed his schooling in 1781 and that same year took a position as authorized agent of the General Post Office in Copenhagen. By 1792 he had transferred into the Danish foreign service proper. The following year, 1793, he was stationed in Vienna.

  Vienna in the 1790s was still absorbing the loss of Mozart, who had died in 1791. Nissen's diplomatic post brought him into contact with the circles surrounding the composer's estate. In 1797, four years into his Vienna posting, he first met Constanze Mozart. Their relationship started simply: he was her tenant.

• 3. A Household and Its Labour

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  Constanze had spent the years since 1791 fighting poverty while raising two sons. She obtained a pension from the Emperor, organized concerts of Mozart's music, and sold manuscript works to publishers. That ongoing labour was what Nissen walked into. He gradually took over much of the negotiating with publishers, and scholar Ruth Halliwell described his eventual role with Constanze's children as that of "a caring father."

  By September 1798 the two were living together. On the 26th of June 1809 they married at St Martin's Cathedral in Pressburg, the city now called Bratislava. Napoleon's armies had occupied Vienna at the time, and the foreign diplomatic corps had decamped to Pressburg. The marriage produced no children. In 1812 the couple moved to Copenhagen, where Nissen took up a post as a censor, settling at Lavendelstræde 1, a street where many period buildings still stand.

• 4. Building the Archive

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  Nissen retired in 1820 and the couple moved to Salzburg. Work on the Mozart biography began in earnest in 1823. The single most valuable acquisition came from Mozart's elderly older sister Maria Anna, known as Nannerl, who gave Nissen and Constanze a collection of roughly 400 Mozart family letters.

  Nissen did not stop with letters. He sought out people who had known the composer personally and conducted interviews with them. He also tracked down commemorative coins and monuments. His stated goal was to document everything that had been written about Mozart and to ground the resulting portrait in primary sources. Constanze was the most immediate of those sources: she had lived alongside Mozart and had committed his inheritance to Nissen's care. Nissen also aimed to mediate between two earlier biographical accounts, those by Niemetschek and Schlichtegroll, whose perspectives he regarded as needing reconciliation.

• 5. Biographical Respect and Its Costs

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  Nissen edited the letters he collected, particularly Mozart's own correspondence. He explained his reasoning in the biography's foreword: "There is a need for a lot of selection to extract something attractive and characteristic in the letters, which can be offered to the public, without harming the fame and the esteem of the name-human." He went further, writing that "one desires not to, one must not show one's hero publicly in the way in which he portrayed himself in evenings of familiarity."

  Later scholars called this practice bowdlerization. They generally accepted that Nissen's motive was protective rather than deceptive, but they worked to reverse his editorial decisions in the interest of scholarly accuracy. A separate problem traced back to Constanze. Maynard Solomon argued she had developed an interest in exaggerating Mozart's poverty and lack of recognition during his lifetime. She validated numerous false reports in the biography, many originating with publisher Friedrich Rochlitz, alleging that Mozart was exploited by impresarios, publishers, and fellow musicians.

• 6. An Unfinished Book and a Flawed Completion

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  Nissen died on the 24th of March 1826, aged 62, in Salzburg, with the material still being assembled. Only the incomplete preface can be fully attributed to him. The task of finishing the biography from his notes passed to Johann Heinrich Feuerstein, born in 1797, a medical doctor and Mozart enthusiast from Pirna.

  Scholars Angermüller and Stafford described Feuerstein as "unstable" and judged the resulting work "problematic," noting that large sections drew from earlier accounts of dubious reliability and that the text contained contradictions and errors. Ruth Halliwell was sharper: "the book was cobbled together in a haphazard fashion from the raw material, and the result was disastrous in terms of quality." The letters it quoted had been selected and censored. The biography appeared posthumously in 1829 under the title Biographie W. A. Mozart's. Nach Originalbriefen, Sammlungen alles uber ihn Geschriebenen, mit vielen neuen Beylagen, Steindrucken, Musikblattern und einem Facsimile, though some sources record the date on the title page as 1828.

  Whether the biography's weaknesses belong to Nissen, to Feuerstein, or to both remains contested. What scholars do not contest is the value of Nissen's collecting effort. The roughly 400 family letters from Nannerl, the interviews with Mozart's contemporaries, the coins and monuments, the drive to assemble everything before witnesses died: that archive is what researchers have returned to for two centuries, even as they struggle with what was done to it.