Alexander Wheelock Thayer 
Ludwig van Beethoven (Biography in 3 Volumes) 

This biography of Ludwig van Beethoven is the first scholarly biography of Ludwig van Beethoven, covering Beethoven’s life to 1816. Thayer became aware of many discrepancies in the already existing biographies of Beethoven, so in 1849 he sailed for Europe to undertake his own researches, learning German and collecting information. Still after many updates Thayer’s biography of Beethoven is regarded as a standard work of reference on the composer.