Vladimir Igorevich Arnold (1937-2010) was an influential Soviet and Russian mathematician, considered one of the greatest of the 20th century for his fundamental contributions to a vast number of areas. A student of Andrey Kolmogorov, his career is inextricably linked to the Kolmogorov-Arnold-Moser (KAM) theorem, which revolutionized the study of dynamical systems and the understanding of the stability of quasi-periodic motions. His pioneering work extended to singularity theory, where his classification of elementary catastrophes became a cornerstone of the field, as well as to symplectic topology, algebraic geometry, and hydrodynamics. He worked for many years at the Steklov Institute of Mathematics in Moscow and later at Paris Dauphine University. His style, characterized by a deep geometric intuition, influenced generations of mathematicians. For his extensive work, he received numerous international awards, including the Lenin Prize (1965), the Crafoord Prize (1982), the Wolf Prize in Mathematics (2001), and the Shaw Prize (2008).