Richard Alan Cash, M.D., M.P.H. (born June 9, 1941) is an American global health researcher, public health physician, and internist. He is a Senior Lecturer in International Health at the Harvard T.H. Chan School of Public Health in Boston. Cash began his international career over 40 years ago when he was assigned by NIAID of the NIH to the Pakistan-SEATO Cholera Research Laboratory (CRL) in Dhaka, East Pakistan (now the ICDDR,B in Dhaka, Bangladesh). While there, he and his colleagues developed and conducted the first clinical trials of oral rehydration therapy (ORT) in adult and pediatric cholera patients and patients with other infectious causes of diarrhea. This technology matches the volume of fluid losses from dehydration patients with the volume they consume so that the fluid replac