Hilbert refers to David Hilbert, a prominent German mathematician known for his foundational contributions to various areas of mathematics, including algebra, geometry, and mathematical logic. He is best known for Hilbert's problems, a list of 23 unsolved problems presented in 1900 that guided much of 20th-century mathematics. In addition to his work in pure mathematics, Hilbert developed the Hilbert space concept, which is fundamental in quantum mechanics and functional analysis. His influence extends beyond mathematics, impacting fields such as computer science and philosophy, where his ideas about formal systems and proofs continue to be relevant.