Ivers joined the non-profit organization, Partners In Health (PIH) in 2003 as a clinical director as it began its collaboration with the Haitian government. She helped expand the organizations reach across Haiti from a three-room clinic to several new buildings including a clinic that contains examining rooms, a laboratory, a pharmacy, a small inpatient ward, and isolation rooms for TB patients. During her time in Haiti, the country suffered a cholera outbreak and earthquake. Following the January 2010 earthquake in Haiti, she was appointed Chief of Mission for PIH and subsequently led a major humanitarian and public health response, resulting in increased access to HIV and TB treatment. In recognition of her efforts in Haiti, Ivers was honored as the 2011 Distinguished Graduate for UCD and the recipient of the Bailey K. Ashford Medal from the American Society of Tropical Medicine and Hygiene. Ivers later published a paper in 2015 showing that PIH's intervention and vaccine distribution slowed the spread of cholera in villages north of Saint-Marc. From 2015 until 2017, she was a member of the executive leadership team at PIH responsible for global strategic implementation and served as a technical advisor to the World Health Organization and the Haitian Ministry of Health.