He graduated from the Norwegian School of Economics and Business Administration in 1947, and was hired in the paint company Alf Bjercke.
He eventually became Chief Executive Officer, but following the merger in 1972, he was the Chief Financial Officer of Jotun from 1972 to 1991. He has been involved in Rotary, as a Paul Harris Fellow.
Blehr has chaired the National Paint & Coatings Association—his employers" association—and is a former member of the board of the Federation of Norwegian Industries as well as several companies.