- Profession: Businessman, merchant, poet, composer.
- Relation to Mahler: Gustav Mahler stayed in his houses in Dornbach and Vienna (Walfishgasse 12). Friend.
- Correspondence with Mahler:
- Born: 02-07-1845 Breslau (Wroclaw), Poland.
- Died: 04-03-1906 Berlin, Germany.
- Buried: 00-00-0000 Unknown.
Also: Hugo Cohn. Musical. Friend of Johannes Brahms (1833-1897). "Ziguenerlieder" (Gypsy Songs) by Johannes Brahms was composed largely via his relationship with the Jewish family of Hugo Conrat in Vienna.
Married to: Ida Conrat (born 06-01-1857 Vienna, died 30-06-1938 Vienna, sculptress).
Daughter: Erica Tietze-Conrad (born 1883 Vienna, died 1958 New York, art historian) was befriended with Alexander von Zemlinsky (1871-1942) and Arnold Schoenberg (1874-1951)). Erica (Tietze-)Conrat came from a prominent Jewish family in Vienna, which had converted to Protestantism. She was the youngest of three sisters, and the oldest, Ilse Conrat was a sculptor. The father Hugo Conrat (also known as Hugo Cohn) was an avid music lover and friends of Johannes Brahms. Erica was highly musical, played the piano and was among others friends with Alexander von Zemlinsky and Arnold Schoenberg, through which they met Karl Kraus. They also shared a long-standing friendship with Alma Mahler.
Daughter: Ilse Beatrix Amalia von Twardowski (Conrat) (b 20-01-1880 Vienna, died 09-08-1942 Munich, artist) was befriended with Alma Mahler (1879-1964).