• Was a Swiss Baroque painter, art consultant and art dealer.
• Gsell was born in St. Gallen.
• He married his first wife in 1697, Marie Gertrud von Loen of Frankfurt am Main.
• They moved to Amsterdam in 1704.
• His wife died and he remarried Anna Horstmans, but divorced her in 1715, when he married a third time to Dorothea Maria Merian, the daughter of
Maria Sibylla Merian.
• The couple was recruited by Peter the Great in 1716 and went to Russia.
• In Russia he became first curator of the Imperial art gallery founded in 1720.
• His wife, Maria-Dorothea, became the curator of the Kunstkamera.
• Gsell died, aged 67, in St. Petersburg and his wife survived him by three years.