--- title: Les Roberts | TIME description: Les Roberts is an Epidemiologist and Professor Emeritus at the Columbia University Mailman School of Public Health. He has taken part in the field measurement of mortality in crises including: Rwanda 1994, more than 30 health Zones in the Democratic Repoublic of Congo 1999-2002, Iraq 2004, Zimbabwe 2007, the Central African Repbulic 2009, 2018, and 2022, and Sierra Leone 2000 and 2014. canonical: https://time.com/author/les-roberts/ og:title: TIME | Current & Breaking News | National & World Updates og:description: Breaking news and analysis from time.com. Politics, world news, photos, video, tech reviews, health, science, and entertainment news. og:url: https://time.com/author/les-roberts/ og:site_name: TIME og:image: https://static.time.com/v3/assets/bltea6093859af6183b/bltde093bcdab65f2d0/6988d9b9bc6cfc69913e2a3c/time-logo.jpg?branch=production og:image:width: 300 og:image:height: 300 og:image:alt: Breaking news and analysis from time.com. Politics, world news, photos, video, tech reviews, health, science, and entertainment news. og:type: profile twitter:card: summary twitter:title: TIME | Current & Breaking News | National & World Updates twitter:description: Breaking news and analysis from time.com. Politics, world news, photos, video, tech reviews, health, science, and entertainment news. twitter:image: https://static.time.com/v3/assets/bltea6093859af6183b/bltde093bcdab65f2d0/6988d9b9bc6cfc69913e2a3c/time-logo.jpg?branch=production --- # Les Roberts ## Les Roberts _Les Roberts is an Epidemiologist and Professor Emeritus at the Columbia University Mailman School of Public Health. He has taken part in the field measurement of mortality in crises including: Rwanda 1994, more than 30 health Zones in the Democratic Repoublic of Congo 1999-2002, Iraq 2004, Zimbabwe 2007, the Central African Repbulic 2009, 2018, and 2022, and Sierra Leone 2000 and 2014._ ## Les Roberts *  Mar 15, 2024 ### [The Science Behind the Gaza Death Toll](https://time.com/6909636/gaza-death-toll/) Some have questioned the growing death toll in Gaza, but a leading expert explains why it's correct. [IDEAS](/section/ideas/) Meta: null ```json [{"@context":"https://schema.org","@type":"Organization","@id":"https://time.com/","name":"TIME","url":"https://time.com/","logo":{"@type":"ImageObject","url":"https://time.com/images/logo.png","width":528,"height":156},"foundingDate":"March 3, 1923","sameAs":["https://www.facebook.com/time","https://www.instagram.com/time/?hl=en","https://twitter.com/time","https://www.pinterest.com/timemagazine"]},{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"https://time.com/","name":"Home"}},{"@type":"ListItem","position":2,"item":{"@id":"https://time.com/author/les-roberts/","name":"Les Roberts"}}]},{"@context":"https://schema.org","@type":"Person","@id":"https://time.com/author/les-roberts/","mainEntityOfPage":{"@type":"WebPage","@id":"https://time.com/author/les-roberts/"},"name":"Les Roberts","jobTitle":null,"description":"Les Roberts is an Epidemiologist and Professor Emeritus at the Columbia University Mailman School of Public Health. He has taken part in the field measurement of mortality in crises including: Rwanda 1994, more than 30 health Zones in the Democratic Repoublic of Congo 1999-2002, Iraq 2004, Zimbabwe 2007, the Central African Repbulic 2009, 2018, and 2022, and Sierra Leone 2000 and 2014.","url":"https://time.com/author/les-roberts/","worksFor":{"@type":"Organization","name":"TIME","url":"https://time.com/"}}] ```