Dr. Darrall is a speech therapist at the Bolton Community Health Care Trust in the United Kingdom. She holds a B.S. with first class honors in agricultural botany from the University of Wales, a Ph.D. in botany from the University of Wales, Aberystwyth, and an M.S. in speech and language pathology and therapy from the University of London. For 14 years Dr. Darrall worked in the area of environmental research at the National Power, Technology, and Environmental Centre, at Leatherhead, studying the environmental impact of electricity generation, and in particular the physiological effects of gaseous air pollutants on agricultural crops and trees.