William Arthur ("Art") Kirk was an Americanmathematician. His research interests includenonlinear functional analysis, the geometry ofBanach spaces andmetric spaces. In particular, he made notable contributions to thefixed point theory of metric spaces; for example, he is one of the two namesakes of theCaristi-Kirk fixed point theorem of 1976. He is also known for theKirk theorem of 1964.

He completed his PhD, entitled "Metrization of Surface Curvature", at theUniversity of Missouri in August 1962 under the supervision ofLeonard Blumenthal. He then became an assistant professor of mathematics at theUniversity of California, Riverside from 1962 to 1967. Starting in 1967 he worked at theUniversity of Iowa, as a full professor of mathematics since 1971 and as department chair from 1985 to 1991.

He held anhonorary doctorate fromMaria Curie-Skłodowska University, an institution which was an early centre of study for the fixed point theory of metric spaces.

He died on October 20th, 2022.^[1]

• William Arthur Kirk at theMathematics Genealogy Project
• William A. Kirk's personal webpage at the University of Iowa
• Honorary doctorate from Maria Curie-Skłodowska University:
  • Kazimierz Goebel's introduction
  • William A. Kirk's acceptance speech

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