Paxson Barker Barker, a PhD student at the University of Maryland School of Nursing, is spreading the word about harsh cleaning products used by hospitals and the need for hospitals to adopt greener cleaning practices. Maryland hospitals are on the forefront of a movement to reduce waste, eliminate toxic chemicals and raise awareness for healthier healthcare. At the University of Maryland School of Nursing's Environmental Health Education Center, for example, director Barbara Sattler and her colleagues are researching and educating healthcare professionals on environmental health.