Mary Ann Horton (formerly Mark R. Horton, born 1955), Usenet and Internet pioneer
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Mark Horton (Kung Fu) Kung Fu expert from England, who lives in Holland, with the highest rank under grandmaster Doc Fai Wong
Mark Twain | Mark | Mark Wahlberg | Mark Knopfler | Mark Zuckerberg | Mark Rothko | Mark Antony | Mark the Evangelist | Gospel of Mark | Mark Ronson | Mark Spitz | Mark Foley | Mark Murphy (singer) | Mark Murphy | Mark McGwire | Mark Hamill | Deutsche Mark | Mark Taper Forum | Mark Millar | Mark Lewisohn | Mark Kermode | Mark Lanegan | Willie Horton | Mark Waugh | Mark Rydell | Mark Goodson | John Horton Conway | Horton | Mark Owen | Mark Mothersbaugh |
Mark Horton implemented the first terminfo library in 1981-1982 as an improvement over termcap.