John Weiss
Surgical instrument makers. At 62 The Strand, London, from at least 1826. Founded 1805/6 by John Weiss (b. Johann Jacob Daniel Weiss in Rostock, Germany, 1773, d. in Brighton, Sussex, 1843) who came to England in 1794 and became a naturalised British citizen in 1826; continued by his son, Frederick Foveaux Weiss (1806–89). The company still exists today (2022) in Harlow, Essex, part of Haag-Streit UK.
Sources
BMD (Birth index, Death index)
Census returns of England and Wales 1841 (The National Archives: Public Record Office HO107/739/6/29/21)
England, select births and christenings, 1538–1975 (Ancestry.com, accessed 7 April 2017)
Post Office London directory 1858
Prerogative Court of Canterbury will registers (The National Archives: Public Record Office (PROB 11/1994/127)
Rostock, Germany, parish register transcripts, 1580-1945 (Ancestry.com, accessed 7 April 2017)
Home Office denization and naturalisation papers and correspondence (The National Archives HO1/9/22)