Walter Gautschi is a world-renowned numerical analyst whose research contributions cover a wide range of topics including numerical conditioning, special functions, interpolation and approximation, orthogonal polynomials, quadrature, linear recurrence relations, ordinary differential equations, and history of mathematics. His contributions have had a significant impact on the field, and his papers are widely cited. Walter has published 3 books, 34 book chapters, 160 refereed journal papers, 7 refereed papers in conference proceedings, translated 3 books, and edited 5 conference proceedings. His papers are characterized by their clarity of exposition and will remain excellent resources for researchers in the field. Walter has 4820 citations in Google Scholar and 174,000 citations in Google. His two books: Numerical analysis — an introduction, published by Birkhäuser, and Orthogonal polynomials — computation and approximation, published by Oxford University Press, have set a high standard for graduate textbooks in their respective subjects.