From what I could find on Josef Hoffman, he seemed to be one of those Modernist architects and furniture makers who also worked in the realm of art as well. He was known for his architecture, as well as his heavy use of squares.
Hoffman did a lot of houses, and appears to be known for chairs. He also did domestic furniture, some of which are still in use today. For example, his design for an armchair, the Kubus Armchair is still reproduced today. That armchair is very modern, which straight lines, and follows his tradition of heavily using squares.
Interestingly, he seems to have started his career creating installation spaces for a group of artists to which he belonged to.