Isabelle Jeanson has worked in communications with Medecins Sans Frontieres since 2003. She has visited several Medecins Sans Frontieres projects over the years, including working as an emergency press officer during the 2004 tsunami in Sri Lanka.
Her latest work with Medecins Sans Frontieres has taken her to Colombia, Russia, Nigeria and Papua New Guinea.
She joined the emergency team in Haiti 48 hours after the earthquake struck.
In this exclusive eyewitness account Isabelle blogs from Haiti's earthquake zone.