Michael D. Gray received the Ph.D. degree in mechanical engineering from the Georgia Institute of Technology, Atlanta, GA, USA, in 2015. From 1992 to 2015, he was a Research Engineer with the Georgia Institute of Technology. He is currently a Senior Researcher in clinical therapeutic ultrasound with the Biomedical Ultrasonics, Biotherapy and Biopharmaceuticals Laboratory (BUBBL), Institute of Biomedical Engineering, University of Oxford, Oxford, U.K. His research interests include the use of sound, magnetism, and light for targeted drug delivery; clinical translation of cavitation monitoring techniques; and hearing in marine animals.