- Profession: Leather merchant.
- Residences: Prague.
- Relation to Mahler: Mahlers landlord in Prague, 1871. See House Gustav Mahler Prague 1871-1872 (Golden Angel House, Celetna 29).
- Correspondence with Mahler:
- Born: 1819
- Died: 05-03-1882, Vienna. Aged 63.
- Buried: 08-03-1882, Central cemetery, IFR (Institut für Rechtsmedizin), Institute of Forensic Medicine, Vienna, Austria.
Gustav Mahler was in Prague to study grammar. The Grunfeld family was very rich and had two sons who studied at the Conservatorium. The family had a piano for Gustav Mahler.
Obituary Moriz Grunfeld (1819-1882), 1882.
Eight childred: Alfred Grunfeld (pianist), Heinrich Grunfeld (cellist).