**Stefan M. Brudzynski**

Stefan M. Brudzynski, Ph.D., D.Sc. is a neurophysiologist and neuroscientist, presently Professor Emeritus in the Department of Psychology at Brock University, Canada. Professor Brudzynski, a former Director of the Centre of Neuroscience and Professor of Psychology and Biology, is the recipient of the prestigious Outstanding Achievement Award from the International Behavioral Neuroscience Society for his contribution to the field of Behavioral Neuroscience. He is the editor of two handbooks on mammalian vocalization (2010) and ultrasonic vocalization (2018) published by Elsevier. His main research interest is in animal behavior; particularly, the brain control of ultrasonic vocalization and emotional communication in rodents.

#### **Jeffrey Burgdorf**

Jeffrey S. Burgdorf, Ph.D. is a neuroscientist, presently the Senior Director of research at Gate Neurosciences Inc., and is an adjunct Research Associate Professor at Northwestern University, U.S.A. He studies the brain mechanisms that underlie positive and negative emotions using rodent ultrasonic vocalizations and has been able to translate these findings into the development of novel therapeutics that are currently in clinical trials for psychiatric disorders.
