Andrew, alongside business partner and audio engineer/producer, Phil Kenihan, with their production company, Duffield Kenihan, became the most awarded advertising sound production company in Australia until they parted ways at the end of 2003. Clients included: Qantas, Singapore Airlines, Ford, McDonald's, Adidas, Nike, Cadbury-Schweppes, Holden, Toyota, Coca-Cola, Shell, Carlton Draught, Boag's, Toohey's, Chivas Regal, The National Drug Offensive, SBS, Channel 7, Sony, Panasonic, Canon, Queensland Tourism, Northern Territory Tourism, City of Melbourne, Officeworks, Sportsgirl, Coles, Bonds, and many more.