A cousin of Reiner Gronwalt, Johann Reeß was appointed Mintmaster for Cologne (City), Germany, in 1605. He died in office
shortly before 8 October 1629. After his death Conrad Duisberg took his minting dies into safe keeping Lit.: Alfred Noss,
Die Münzen der Städte Köln und Neuss: 1474-1794 (1926), pp. 47-49, 121, 139, 162; Wolfgang Scheffler, Goldschmiede Rheinland-Westfalens
- Aachen – Köln, Walter de Gruyter, 1973, p. 462; Wolfgang Scheffler, Goldschmiede Rheinland-Westfalens - Aachen - Köln (1973)
p. 484.