Ivo M. Babuška (born March 22, 1926, in Prague) is a mathematician with Czech-American citizenship, noted for his studies of the finite element method and the proof of the Babuška–Lax–Milgram theorem in partial differential equations. One of the celebrated result in the finite elements is the so-called Ladyzenskaja–Babuška–Brezzi (LBB) condition (also referred to in some literature as Banach–Necas–Babuška (BNB)), which provides sufficient conditions for a stable mixed formulation. The LBB condition has guided mathematicians and engineers to develop state-of-the-art formulations for many technologically important problems like Darcy flow, Stokes flow, incompressible Navier–Stokes, nearly incompressible elasticity. He is also well known for his work on adaptive methods and the p-- and hp--versions of the finite element method. He also developed the mathematical framework for the partition of unity methods. Babuska was elected as a member to the National Academy of Engineering in 2005 for contributions to the theory and implementation of finite element methods for computer-based engineering analysis and design. Life Ivo Babuška was born on March 22, 1926, in Prague, the son of architect Milan Babuška (who designed the National Technical Museum in Prague) and his wife Marie. He studied civil engineering at the Czech Technical University in Prague, where he received the Dipl. Ing in 1949. In 1951 he received the degree Dr. Tech.; his doctoral dissertation was supervised by Eduard Čech and Vladimir Knichal. From 1949 he studied at Mathematical Institute of the Czechoslovak Academy of Sciences and then was the head of the Department of Partial Differential Equations. In 1955, he received a C.Sc (=Ph.D.) in mathematics and in 1960 D.Sc. in mathematics. He is married to Renata and they had two children, a girl, Lenka and a boy, Vit. Babuška fled Communist Czechoslovakia in 1968 with barely more than he could carry, following a conference in Western Europe, and emigrated to the United States. After many years as a professor at the University of Maryland, he eventually moved to the University of Texas at Austin where he spent many years at the Oden Institute for Computational Engineering and Sciences. He moved to New Mexico in 2020, following retirement in 2018 at the age of 92. Work Babuška works in the field of mathematics, applied mathematics, numerical methods, finite element methods, and computational mechanics. In 1968, he became a professor at University of Maryland, College Park in the mathematics department, which is part of the University of