John Rennie finds it’s great to be editor in chief of Scientific American, but not when all the ingredients of sarin gas are in his office.

John Rennie is a science writer, editor, and lecturer based in New York. Viewers of The Weather Channel know him as the host of the original series Hacking The Planet and co-host of the hit special The Truth About Twisters. He is also the editorial director of science for McGraw-Hill Education, overseeing its highly respected AccessScience online reference and the McGraw-Hill Encyclopedia of Science & Technology. Rennie served as editor in chief of Scientific American (including the monthly magazine, Scientific American Mind, ScientificAmerican.com and other publications) between 1994 and 2009.