Professor David Owen Cosgrove, a pioneer in the clinical applications of ultrasound technologies, passed away on Tuesday the 16th of May 2017, at St. Raphael’s Hospice, North Cheam, London, after a short battle with cancer. He was at the forefront of clinical advances in radiological ultrasound technologies, including microbubble contrast-enhanced ultrasound and ultrasound elastography. David officially retired in 2004, became an Emeritus Professor at Imperial College as well as a Senior Research Investigator at King’s College Hospital, and remained extremely active in the field. David will be dearly missed. An obituary is located in the Ultrasonics In Memoriam section.