Dag Mejdell holds a degree in Economics and Business Administration, a four-year program in economics and business administration consisting of three years at undergraduate level and one year at graduate level from the Norwegian School of Economics (NHH).
Mejdell started his career in the chemical division in Dyno. He held a number of positions in the company, and advanced to become CFO and later President and CEO of Dyno. When Dyno was delisted in 2000, he became President and CEO of Dyno Nobel ASA, a position he held until he became President and CEO of Posten Norge AS in 2006.
Mejdell has held a number of board appointments. He is currently Chairman of Sparebank 1 SR Bank ASA, Chairman of Mestergruppen AS, Chairman of Torghatten AS, and Chairman of International Post Corporation UA CV.