David Chiswell is a British business executive and scientist who co-founded Cambridge Antibody Technology, a biosciences company in operation from 1990 to 2007. The company was an early innovator that pioneered the development of antibody drugs, including adalimumab, used in the treatment of rheumatoid arthritis among other things. CAT was described by The Independent newspaper as "the jewel in the crown of UK biotech." From 1990 to 2002, Chiswell was operationally responsible for running CAT.