Kosta Antonopoulos
Kosta has worked for several years as a Programme Coordinator in the DRC, Burundi, Zambia, Sudan, Pakistan, Yemen, Myanmar and Papua New Guinea. In his early professional years, he worked as a consultant with non-governmental organizations and governmental institutions in Thailand, Sri Lanka, Bahrain and Indonesia. His expertise lies in international affairs and project management, with a special focus on humanitarian issues, politics, diplomacy and humanitarian operations.
He holds a Master's degree in Political Science and most recently spent two years working with MSF-UK as a Policy and Advocacy Advisor. Kosta recently joined the Humanitarian Representation Team (HRT) of MSF-International as the Representative to ASEAN.
Dr. Maria S. Guevara, MD, FCCP
Dr. Maria Guevara is currently the Senior Coordinator, Attacks on Healthcare, for Medecins Sans Frontieres (MSF)/Doctors Without Borders based in Geneva, Switzerland. Prior to which, she held the position of Regional Humanitarian Representative in Asia for MSF from 2012 to 2017, covering mainly the Southeast Asia region.

Originally hailing from the Philippines, Dr. Guevara grew up in the US where she received her medical degree from the University of Alabama, School of Medicine in 1993, followed by Internal Medicine Residency at the University of Nevada and Pulmonary and Critical Care Fellowship at the University of Florida, College of Medicine. She was inducted as a Fellow of the American College of Chest Physicians in 2003 and was a recipient of the CHEST Foundation International Humanitarian Recognition Award in 2006. She also has a Diploma in Tropical Medicine from the Liverpool School of Tropical Medicine and Hygiene and a Masters of Global Health Policy from the London School of Hygiene and Tropical Medicine.

Dr. Guevara joined MSF in 2004 after practicing in various emergency and intensive care units in the US and serving as faculty at the University of Florida. She has done field work for MSF in Liberia, Guatemala, Haiti, DRC, Nigeria, Myanmar, Philippines, Indonesia, Malaysia, and South Sudan in both emergency and stable settings. Her field roles have been as diverse as field doctor, hospital director, project coordinator, liaison officer, medical focal point, medical coordinator and interim Head of Mission. As MSF regional representative in Asia, she served as a member of the Advisory Group on Reform of WHO’s Work in Outbreaks and Emergencies with Health and Humanitarian Consequences from July 2015 to January 2016. Aside from MSF, Dr. Guevara is also serving as SAFE STEPS First Aid Ambassador. She speaks English, French, Spanish and Tagalog.
Dr. Lim Chin Siah
Dr Lim Chin Siah is a field worker with MSF since 2013 and has been to several missions such as Pakistan, Afghanistan, Yemen and most recently, Iraq. Awarded a Healthcare Humanity Award 2016 by the Courage Fund of Singapore, he currently
works as a Consultant in the Department of Emergency Medicine at Singapore General Hospital. Dr Lim was working at the Abs Hospital in Yemen’s Hajjah governorate from January to May 2016. Two months later in August 2016, the Abs Hospital was hit by an airstrike killing 19 people, including one MSF staff member, and injuring 24 others. Dr Lim has most recently returned from Raqqa City in Syria after working as the Medical Activity Manager at Raqqa Clinic's Trauma Stabilising Point between January to March 2018.
Dr. Natasha Reyes
Dr. Natasha Reyes is currently the director of the Operations Support Unit of Médecins Sans Frontières (MSF) / Doctors Without Borders (Hong Kong). She has been working with MSF since 2007, and has worked as a field doctor, ER doctor, field coordinator, emergency coordinator and medical coordinator in emergency and unstable contexts. Her work has brought her to India, Kenya, South Sudan, Pakistan, Afghanistan, Libya, Philippines, Colombia, Sierra Leone, Liberia Nauru, Nepal and Bangladesh. 

She has worked in various contexts such as outbreaks (measles, cholera, Hepatitis E and Ebola), natural disasters (including Typhoon Haiyan), displaced populations and trauma care in conflict. In her most recent field missions, she was the medical coordinator for MSF’s Ebola intervention in Liberia in 2014, Head of Mission for the Nepal Earthquake Intervention in 2015, and Project Coordinator for the Marawi Crisis intervention. In August last year she visited Bangladesh for an emergency assessment of the Rohingya crisis.

Dr. Natasha is from the Philippines, where she obtained her Medical Doctorate from the University of Santo Tomas, and specialized in Emergency Medicine at the Makati Medical Center. She was inducted as a Fellow of the Philippine College of Emergency Medicine in 2007 and completed the European Master in Disaster Medicine in 2016.
Alvin Teo
Alvin Teo graduated with a Bachelors of Pharmacy in 2010 and is a registered pharmacist in Malaysia. He joined MSF in 2013 as project pharmacist in a refugee camp in South Sudan and has since been a part of MSF’s humanitarian projects in Syria, Pakistan and Ukraine.
Alvin is now pursuing his PHD at the National University of Singapore.
Wong Li Wai
Li Wai is a Singaporean nurse graduated from Nanyang Polytechnic. In 2011, she obtained a Professional Diploma in Tropical Nursing in Liverpool School of Tropical Medicine.
Before joining for Doctors Without Borders/Médecins Sans Frontières (MSF), she was a staff nurse at Institute of Mental Health for three years.
She became a full-time field worker with MSF in 2012. Her first assignment with the organisation was to work in an HIV/AIDS project in remote communities of Zambia, southern Africa. It was followed by a nine-month assignment in medical emergency aid at the youngest country South Sudan.
During the peak of Ebola epidemic in West Africa in 2014, Li Wai is one of the international staff of MSF from the region who heed the call to help fight Ebola in Sierra Leone. She is part of MSF Ebola emergency response team twice. On her first stint, as a nurse, she was in-charge to care for Ebola patients in the Ebola management centre along with national staff.