Architect.  Isak studied engineering and later architecture at the Institute of Technology in Stockholm, where he was a student of A. T. Gellerstedt, and later at the architectural school of the Academy of Arts. He received the royal medal in 1881 and studied abroad 1883-1886. Isak was elected member of the Academy of Arts in 1889, appointed professor of architecture at the Royal Institute of Technology in 1889 and became first surveyor in the Chief Surveyor’s Office in 1904. His first major work was the Bünsow building (1886-1888) at Strandvägen in Stockholm, commissioned by the sawmill baron Friedrich Bünsow. It broke new ground in its use of natural material throughout (limestone and bricks) rather than the plaster that had been dominant in Swedish architecture until that point. His largest commission was the Nordic Museum on Djurgården, which he began in collaboration with M. Isaeus but continued alone after Isaeus’s death in 1890. The building was partly finished for the Stockholm Exhibition in 1897, and completed a few years later. (bio by: Shock)