He married Eliza Sarah Muncey in 1821. His advertisement in Hutchinson's Nova Scotia directory describes his company as "importers of British and foreign dry goods" He served on the town council for Halifax from 1844 to 1848 and again in 1858. Mignowitz died in Halifax.
- A Directory of the Members of the Legislative Assembly of Nova Scotia, 1758-1958, Public Archives of Nova Scotia (1958)
- Hutchinson's Nova Scotia directory, for 1864-65 ... (1864) Archived 2011-06-15 at the Wayback Machine p. 575