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{title2=1923-2016}
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= T. M. Apostol
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<Tom M. Apostol> contributed mathematical reference material on special <functions> and <number theory>, including the <zeta function> and <Dirichlet characters>. These topics connect infinite series, <integer arithmetic> and analytic identities.<nist-digital-library-of-mathematical-functions/25.6 Integer Arguments>[author attribution and the described mathematical development]{ref}

Official profile, including a portrait: https://dlmf.nist.gov/about/bio/TMApostol

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{title=Portrait of <Tom M. Apostol>}
{description=Unidentified photographer; Caltech yearbook The Big T 1965; existing Commons portrait extract. https://commons.wikimedia.org/wiki/File:Tom_Apostol_1965.png[Commons PD-US-no-notice claim for US publication without copyright notice during 1931–1977; other jurisdictions may retain protection.], via Wikimedia Commons.}
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 Tom M. Apostol (source code)