Haug, son of a farmer, devoted himself since 1848 in Tübingen and Göttingen, particularly the study of Sanskrit and habilitated in 1854 in Bonn, where he moved in 1856 to Heidelberg to participate at the invitation of Bunsen at the Bible work. 1859 following a call to India, he was hired at Poona College as Sanskrit Professor and Superintendent of Sanskrit studies.
His extensive knowledge of the scriptures of the Parsees and Hindu brought him into familiar intercourse with the most learned priests of both religions, and he achieved thus very precise knowledge of their worship, to give him in enabled, many new contributions to the understanding of the Zend-Avesta and the Vedas. In 1863 he undertook on behalf of the British government a scientific journey through the province of Gujarat, where he received several precious Zend, Pahlavi and Sanskrit manuscripts. Family and health considerations called him in 1866 to Germany, where he was hired in 1868 as a full professor of Sanskrit and comparative linguistics at the University of Munich. He developed great significance as a teaching, but died June 3, 1876 in Bad Ragaz, a then renowned Lungenheilort.
Important contributions to the understanding of the Zend-Avesta, especially his oldest parts are: "The five Gathas, or collections of songs and sayings of Zoroaster, etc. " (Leipzig 1858-62, 2 volumes) and calculated on a further circle of readers "Essays on the sacred language, writings and religion of the Parsees " ( Bombay, 1862, 2nd revised edition of West, London 1878).
Haug's main plant in ancient Indian literature area is the translation issue and one of the oldest Vedic ritual books, the " Aita - reya Brâhmana of the Rigveda " ( Bombay, 1863, 2 volumes).
From early writings are: "On the script and language of the second cuneiform genus " (Göttingen 1855) and "On the Pehlewisprache and Bundehesch " (Göttingen 1854). "An old Zand - Pahlavi glossary " (London and Bombay, 1867) and " On the Pahlavi, whose real cryptanalysts he is the most recognized works Haug, the writings published in Bombay in association with one of the most learned Parsenpriester behalf of the Government relating an old Pahlavi Pâzand glossary ", with a longer " Essay on the Pahlavi language " (ibid., 1870); then with the support of the English West published "Book of Arda Viraf together with other Pahlavi texts", with translation, notes, glossary, and a short grammar (London 1872-74, 2 volumes).
From other writings of his later years are to be mentioned: "On the present state of Zendphilologie " (Stuttgart 1868) and the 1868-75 published in the papers and meeting reports of the Munich Academy of Sciences work: " Brahma and the Brahmins " (1871 ) "On the nature and value of the Vedic Accents" (1873 ), " Vedic riddles and puzzles Tell Proverbs " (1875 ) and others. His major manuscript collection was purchased after his death by the Munich Court and State Library.
- The Pehlewisprache and Bundehesch (1854 )
- The script and language of the second cuneiform genus (1855 )
- A Lecture on an original speech of Zoroaster (1865 )
- About the nature of the Pehlewisprache (1869 )
- The 18th chapter of the Wendidad (1869 )
- About the Ardai - Vircifnamei (1870 )
- An old Pahlavi Pazand Glossary (1870 )
- Vedic riddles and puzzles Proverbs (1875 )