March Engineering
In 1969 Rees co-founded March Engineering; his initials being the "AR" in "March", alongside Max Mosley, Graham Coaker and Robin Herd. At the end of 1971 he moved to a Shadow Racing Cars where he became team principal. In 1977 he left Shadow to co-found Arrows. In 1996 he and the other remaining founders sold Arrows to Tom Walkinshaw.