Rost started working at Wyeth in approximately 1992; seven years after joining Wyeth, he was promoted to head of Wyeth-Lederle Nordiska, Wyeth's Scandinavian subsidiary. Rost has said that he doubled sales during his tenure. He became concerned about Wyeth's accounting practices and informed upper management of his concerns. Shortly thereafter, he was transferred from Sweden to New Jersey, a move he characterized as a retaliatory demotion. He filed a lawsuit against Wyeth, which was settled out of court for undisclosed terms.