--- title: Theresa Chapple-McGruder | TIME description: Chapple-McGruder is a Chicago area maternal and child health epidemiologist. canonical: https://time.com/author/theresa-chapple-mcgruder/ 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/theresa-chapple-mcgruder/ 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 --- # Theresa Chapple-McGruder ## Theresa Chapple-McGruder _Chapple-McGruder is a Chicago area maternal and child health epidemiologist._ ## Theresa Chapple-McGruder *  May 18, 2021 ### [The CDC’s Abrupt Change to Mask Guidelines Puts People at Risk](https://time.com/6049612/cdc-mask-guidance-mistake/) [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/theresa-chapple-mcgruder/","name":"Theresa Chapple-McGruder"}}]},{"@context":"https://schema.org","@type":"Person","@id":"https://time.com/author/theresa-chapple-mcgruder/","mainEntityOfPage":{"@type":"WebPage","@id":"https://time.com/author/theresa-chapple-mcgruder/"},"name":"Theresa Chapple-McGruder","jobTitle":null,"description":"Chapple-McGruder is a Chicago area maternal and child health epidemiologist.","url":"https://time.com/author/theresa-chapple-mcgruder/","worksFor":{"@type":"Organization","name":"TIME","url":"https://time.com/"}}] ```