Patrick J. Fitzsimmons

Patrick J. Fitzsimmons is a Professor of Mathematics at the University of California San Diego, where he has maintained a continuous faculty appointment since 1987, achieving the rank of full Professor in 1992. His office is located in APM 5715 at UCSD's La Jolla campus, and he maintains an Erdös number of 3.

Education:

• Ph.D. in Mathematics, Case Western Reserve University (1981)
• M.S. in Mathematics, Case Western Reserve University (1978)
• B.S. in Mathematics, Behrend College of the Pennsylvania State University (1976)

Professor Fitzsimmons specializes in Probability Theory with research spanning Stochastic Processes, Markov Processes, and Potential Theory. His work focuses on theoretical aspects of probability, including measure-theoretic approaches to stochastic processes and time changes in Markov processes. He has made significant contributions to the understanding of Revuz measures and their applications in probability theory, with publications appearing in journals like Mathematische Zeitschrift.

Scientific Awards:

• Fellow of the American Mathematical Society
• Fellow of the Institute of Mathematical Statistics (1992)

Professor Fitzsimmons has served as Associate Editor for prestigious journals including The Annals of Probability (1994-2000), Probability Theory and Related Fields (1991-1994), and Potential Analysis (2000-present). He has taught numerous courses at UCSD, particularly in probability theory (Math 180 series) through Spring 2025. His mathematical genealogy traces back to foundational mathematicians including Gauss and Euler through his doctoral advisor K. J. Hochberg.