Mark is changing the way people think of email, they no longer have to be static pages of simple text and image but can now be fully interactive microsites. With Rebelmail he has worked for a number of major brands and has consulted for a number of email clients on developing their rendering capabilities. Among other things, he has built a fully interactive game in email, multi-page emails, 3D products and a fully functional shopping cart and checkout in an email. All this without a line of JavaScript, just pure CSS.

You can often find him discussing the quirks of email rendering on Twitter @M_J_Robbins and as a moderator at the Litmus Community.