He is still working despite being one of the first people in EM. He spends part of the year at San Diego, part in Jackson Hole, part at the U of Arizona in Tucson, and I think part in Boston.
He's popular because he mixes such funny off-color jokes in with his presentations (aside from the book and all.) BTW, he no longer edits the book, as he frequently reminds us when we point out contradictions between "his" book and his lectures.