Otto Treider
Otto Halfdan Treider was a Norwegian educator and preacher.
Treider was born in Drøbak. He founded the Otto Treider Business School in 1882. The institution soon became Norway's largest and leading business school.
As a preacher, Treider supported the Free Church movement and led a group known as the Treider Circle. In 1891 he built the Calmeyer Street Mission House in Oslo.
Treider died in Oslo.
