John E. McCarthy

John E. McCarthy is the Spencer T. Olin Professor of Mathematics at Washington University in St. Louis, with a courtesy affiliation as Professor of Statistics and Data Science. He holds a PhD from the University of California at Berkeley and maintains an active research program spanning multiple mathematical disciplines.

His research interests focus on Operator Theory, Complex Variables, and their interaction, with particular emphasis on One and Several Complex Variables. Professor McCarthy believes that pure mathematicians can bring valuable perspectives to many areas of science and actively seeks collaborations with scientists open to mathematical approaches.

His scholarly output shows consistent engagement with fundamental questions in functional analysis and complex variables, with recent work extending into applications including ultrasound signal interpretation and mathematical perspectives on public health issues like the COVID-19 pandemic. His publications reveal a trajectory from deep theoretical work in operator theory and interpolation problems toward increasingly interdisciplinary applications while maintaining rigorous mathematical foundations.

• Faculty member in the Neuroscience Program of the Division of Biology and Biomedical Sciences (DBBS)
• Founder/editor of the Journal of Xenomathematics, exploring alternative mathematical systems
• Author of multiple influential books including Pick Interpolation and Hilbert Function Spaces and Operator Analysis: Hilbert Space Methods In Complex Analysis

Professor McCarthy is married to Suzanne Langlois, founder of Kaldi's Coffee and interim CEO of Meds and Food for Kids, indicating his connection to entrepreneurial and humanitarian efforts beyond academia.