# Paul Hagelstein, Ph.D.

Professor of Mathematics

## Education

Ph.D., The University of Chicago, 2000 (Advisor: R. Fefferman)

S.M., The University of Chicago, 1995

B.A., Rice University, 1994

## Biography

Paul Hagelstein grew up in Graham, Texas. Majoring in mathematics and physics, he received his undergraduate degree at Rice University. Subsequently he attended graduate school at The University of Chicago where he received a Ph. D. in Mathematics. After a three year postdoctoral fellowship at Princeton University, he joined the Baylor faculty in the fall of 2003. His primary research interest is in harmonic analysis, with most of his work involving geometric maximal operators, convergence of Fourier series, and interpolation theory. While not trying to prove theorems, he enjoys practicing the piano, playing the trombone in the Waco Community Band, and attempting to become a proficient tournament Scrabble player.

## Academic Interests and Research

Dr. Hagelstein's research is in harmonic analysis.

## Selected Publications

Hagelstein, P. A. and Parissis, I. *Density bases associated to Nagel-Stein approach regions*, Studia Math. 251 (2020), 317-326.

Dmitrishin, D., Hagelstein, P. A., Khamitova, A., and Stokolos, A., *Limitations of robust stability of a linear delayed feedback control*, SIAM J. Control Optim. 56 (2018), 148-157.

Hagelstein, P. A. and Parissis, I., *Solyanik estimates and local Holder continuity of halo functions of geometric maximal operators*, Adv. Math. 285 (2015), 434-453.

Hagelstein, P. A., Luque, T., and Parissis, I., *Tauberian conditions, Muckenhoupt weights, and differentiation properties of weighted bases*, Trans. Amer. Math. Soc. 367 (2015), 7999-8032.

Hagelstein, P. A. and Stokolos, A. *Tauberian conditions for geometric maximal operators*, Trans. Amer. Math. Soc. 361 (2009), 3031-3040.

## Teaching Interests

Dr. Hagelstein enjoys teaching students at all levels, ranging from Freshman Precalculus to Graduate Complex Analysis.

## Courses taught at Baylor

MTH 1304 Precalculus

MTH 1321 Calculus I

MTH 1321(H2) Honors Calculus I

MTH 1322 Calculus II

MTH 1322(H2) Honors Calculus II

MTH 2321 Calculus III

MTH 3326 Partial Differential Equations

MTH 4326 Advanced Calculus I

MTH 4327 Advanced Calculus II

MTH 5323 Theory of Functions of Real Variables I

MTH 5324 Theory of Functions of Real Variables II

MTH 5350 Complex Analysis

MTH 5V23 Special Topics in Analysis

MTH 6V23 Advanced Topics in Analysis