USA
Wilding Cran Gallery

http://wildingcran.com/artists/#/martin-werthmann-1/
939 South Santa Fe Avenue,  Los Angeles  CA   90021
info@wildingcran.com

Germany
Heldenreizer Contemporary

https://en.heldenreizer.com/martin-werthmann
Türkenstrasse 32
80333 München
info@heldenreizer.com