1.0The Global Centre for Advanced Studieshttps://gcas.ie/decrestondavishttps://gcas.ie/de/author/crestondavis/rich600338<blockquote class="wp-embedded-content" data-secret="2wT7ZeZixp"><a href="https://gcas.ie/de/faculty/john-ehrenfeld/">Dr. John R. Ehrenfeld</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://gcas.ie/de/faculty/john-ehrenfeld/embed/#?secret=2wT7ZeZixp" width="600" height="338" title="„Dr. John R. Ehrenfeld“ – The Global Centre for Advanced Studies" data-secret="2wT7ZeZixp" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script> /*! This file is auto-generated */ !function(d,l){"use strict";l.querySelector&&d.addEventListener&&"undefined"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!/[^a-zA-Z0-9]/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),o=l.querySelectorAll('blockquote[data-secret="'+t.secret+'"]'),c=new RegExp("^https?:$","i"),i=0;i<o.length;i++)o[i].style.display="none";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute("style"),"height"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):"link"===t.message&&(r=new URL(s.getAttribute("src")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener("message",d.wp.receiveEmbedMessage,!1),l.addEventListener("DOMContentLoaded",function(){for(var e,t,s=l.querySelectorAll("iframe.wp-embedded-content"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute("data-secret"))||(t=Math.random().toString(36).substring(2,12),e.src+="#?secret="+t,e.setAttribute("data-secret",t)),e.contentWindow.postMessage({message:"ready",secret:t},"*")},!1)))}(window,document); //# sourceURL=https://gcas.ie/wp-includes/js/wp-embed.min.js </script>https://gcas.ie/wp-content/uploads/2026/01/John.png400400Dr. John R. Ehrenfeld returned to his alma mater, MIT, in 1985 after a long career in the environmental field, and retired in 2000 as the Director of the MIT Program on Technology, Business, and Environment. Following that, he served until 2009 as Executive Director of the International Society for Industrial Ecology, guiding its development […]