Claus-Dieter Ohl is Assistant Professor at the Nanyang Technological University and Adjunct Professor at the Institute of High Performance Computing in Singapore. Previously, he worked as a postdoctoral fellow at Johns Hopkins University, US, and at the University of Twente in the Netherlands. His research is focused on experimental fluid mechanics, in particular utilizing lasers, shock waves, and cavitation bubbles for applications in medical therapy, biology, and engineering. He is currently interested in sonoluminescence and sonochemistry in microfluidics. Besides that, he is curious to figure out how ultrasonic cleaning really works.