Robert H. Morris (July 25, 1932 – June 26, 2011) was an American cryptographer and computer scientist.
Together with Douglas McIlroy, he created the M6 macro processor in FORTRAN IV, which was later ported to Unix.
[5] Using the TMG compiler-compiler, Morris, together with McIlroy, developed the early implementation of the PL/I compiler called EPL for the Multics project.
[12][13][14] He once told a reporter that, while at the NSA, he helped the FBI decode encrypted evidence.
Many readers of Stoll's book remember Morris for giving Stoll a challenging mathematical puzzle (originally due to John H. Conway) in the course of their discussions on computer security: What is the next number in the sequence 1 11 21 1211 111221?