Dr. Mellinger has worked in acoustic signal processing since 1987 and on acoustic detection, classification, and localization of marine mammals since 1992. He has developed a variety of new methods in these fields, and has implemented these and many other existing methods in several software packages. The most popular of these packages, Ishmael, is in use worldwide by hundreds of researchers studying vocalization, distribution, and behavior of marine mammals. He has also led and participated in many passive acoustic field research projects to detect, classify, and locate marine mammals in the Atlantic, Pacific, Arctic, Indian, and Southern Oceans. These projects have employed a variety of passive-acoustic technologies, including fixed moored hydrophones, cabled hydrophone arrays, quasi-fixed real-time hydrophones, and drifting sonobuoys, and have covered many species of marine mammals. He has chaired conferences and workshops since 2002 on passive acoustic monitoring for assessing of the state of the technologies and methods, on animal acoustic communication and behavior, on automated detection, classification, and localization, and density estimation of marine mammals using passive acoustics, and on using detection methods for understanding marine mammal distributions. Since 2008 he has used gliders for passive acoustic monitoring of cetaceans, using them on dozens of glider deployments in the western Atlantic, the northern Gulf of Mexico, and the Pacific off the West Coast, in Alaska, in Hawaii, and in the Mariana Islands.