ロスマンズ
Du Plessis worked in various management positions in the South African Rembrandt Group from 1981, and in 1988 he became Group Finance Director of Compagnie Financière Richemont. He also held the same position at tobacco manufacturer Rothmans International between 1990 and 1995. When Rothmans International was merged with British American Tobacco in 1999, du Plessis became a non-executive director on that board.