[citation needed] He was apprenticed to the decorative painter Wilhelm Krogh in Oslo from 1897 to 1900.

From 1900 to 1903 he studied at the Norwegian National Academy of Craft and Art Industry in Oslo under Oscar Wergeland, Wilhelm Krogh, Asmund Stray, and Eivind Nielsen.

[citation needed] Thømt was awarded a scholarship from the Houen Fund for artistic decorative painting three times.

Around 1915 he was commissioned to decorate the Main Building of the Norwegian University of Science and Technology at Gløshaugen in Trondheim.

He also decorated private homes in Oslo and Trondheim, but the largest share of his works were frescoes and stained glass in various churches.