Paul Farmer is the chair of the Department of GLobal Health and Social Medicine at Harvard Medical School. He is an expert in health care services and advocacy for those who are sick and in poverty. He doesn't appear to be situated in emergency response; he seems to be much more on the follow-up months or years later. Dr. Farmer has myriad publications of relevance to the Network, and his research foci are mostly regarding establishing high-quality health care in resource-poor environments. (http://ghsm.hms.harvard.edu/person/faculty/paul-farmer)
Bruce Nizeye works as the Chief of Infrastructure for PIH in Rwanda. It appears that his expertise is in physical constructs. I could not find how he was situated in emergency response, but it appears that he takes a role on the back side of disasters, much like Dr. Farmer. (http://www.pih.org/blog/the-voices-of-our-colleagues/)
Sara Stulac is an Associate Physician in the Division of Global Health Equity at BWH. She is also the Deputy Chief Medical Director for PIH. She seems to be an expert in pediatrics, specifically HIV care and prevention and oncology. Like her other authors mentioned on this page, she does not seem to be directly involved with emergency response. Her research foci are mostly not related to emergency response, but dealing with non-emergent pediatric care. (http://www.brighamandwomens.org/Departments_and_Services/medicine/servi…)
Salmaan Keshavjee is a professor at HMS and a physician at BWH. He has conducted research on post-Soviet Tajikistan's health transition and worked on an MDR-TB treatment program in Tomsk, Russia. Rather than emergency response, Dr. Keshavjee seems to be focused on epidemiology like his co-authors. He has a number of research foci including MDR-TB treatment and policy, health-sector reform in transnational societies, the role of NGOs in the formation of trans-border civil society, and "modernity, social institutions, civil society, and health in the Middle East and Central Asia. (http://ghsm.hms.harvard.edu/person/faculty/salmaan-keshavjee)