Marianna Csörnyei (born October 8, 1975 in Budapest) is a Hungarian mathematician. She works in real analysis, geometric measure theory, and geometric nonlinear functional analysis. She proved the equivalence of the zero measure notions of infinite dimensional Banach spaces.
She received her doctorate from Eötvös Loránd University in 1999 at the age of 24. She was a professor at the Mathematics Department of University College London between 1999–2011. Currently, she is at the University of Chicago. She won a 2002 Whitehead Prize and a Royal Society Wolfson Research Merit Award that same year.
Csörnyei was awarded the Philip Leverhulme Prize [1] for Mathematics and Statistics in 2008 for her work in geometric measure theory.[2]
Csörnyei spends the 2009/2010 academic year at the Yale University as visiting proefssor.[3] She was an invited sectional speaker[4] at the International Congress of Mathematicians, in 2010.
She is contributing editor of the mathematical journal Real Analysis Exchange.
Her Erdős number is 2 via David Preiss[5]