Leonid Berlyand is a Soviet and American mathematician, a professor of Penn State University.

Berlyand has authored roughly 100 works on homogenization theory and PDE/variational problems in biology and material science.

He has organized a number of professional conferences and serves as a co-director of the Center for Mathematics of Living and Mimetic Matter at Penn State University.

He obtained mathematical results applicable to diverse scientific areas including biology, fluid mechanics, superconductivity, elasticity, and material science.

[8] Together with H. Owhadi, he introduced a "transfer-of-approximation" modeling concept, based on the similarity of the asymptotic behavior of the errors of Galerkin solutions for two elliptic PDEs.