Denis Wirtz, Johns Hopkins University (IMAGE) Johns Hopkins University Caption Denis Wirtz, professor of chemical and biomolecular engineering in the Whiting School of Engineering at the Johns Hopkins University. Credit JHU Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.