1.0PΕΝ Greecehttps://pen-greece.org/en/PenGreecehttps://pen-greece.org/en/author/pengreece/rich600338<blockquote class="wp-embedded-content" data-secret="0IYpnEZwwl"><a href="https://pen-greece.org/en/melh-pen-greece/ioannis-vallios/">Ioannis Vallios</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://pen-greece.org/en/melh-pen-greece/ioannis-vallios/embed/#?secret=0IYpnEZwwl" width="600" height="338" title="“Ioannis Vallios” — PΕΝ Greece" data-secret="0IYpnEZwwl" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script type="text/javascript"> /* <![CDATA[ */ /*! 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://pen-greece.org/wp-includes/js/wp-embed.min.js /* ]]> */ </script> https://pen-greece.org/wp-content/uploads/2026/05/Giannis-Vallios-photo-12-03-26.jpg583778Ioannis Vallios is a Mechanical Engineer with a postgraduate degree in energy and environmental management. With many years of presence in the Greek and international energy market, he has contributed to specialized and innovative projects, collaborating with extroverted technical companies. At the same time, he creatively moves in the field of poetry, music and literature, [...]