My deepest, heartfelt condolences to Jon's family and friends. I had the pleasure of taking one of Jon's classes (Human Health Risk Assessment) he taught at the University of Cincinnati; his delivery and humor made the material especially engaging...probably my all-time favorite course! I also had the honor of getting to know Jon on a personal level thereafter as we both worked in the same building at the EPA; I'd always take a few minutes to speak with him whenever we crossed paths and would walk away with a smile on my face moments later. Just such a nice, cool dude! I'll miss him too.