Mark Crispin

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2026-06-25

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Who is this?

Mark Reed Crispin (July 19, 1956 in Camden, New Jersey – December 28, 2012 in Poulsbo, Washington) is best known as the father of the Internet Message Access Protocol (IMAP), having invented it in 1985 during his time at the Stanford Knowledge Systems Laboratory. He is the author or co-author of numerous RFCs and was the principal author of UW IMAP, one of the reference implementations of the IMAP4rev1 protocol described in RFC 3501. He also designed the MIX mail storage format. Crispin earned a