Although this Seventh Edition no longer bears their byline, Ken Thompson and Dennis Ritchie remain
the fathers and preceptors of the UNIX† time-sharing system. Many of the improvements here described
bear their mark. Among many, many other people who have contributed to the further flowering of
UNIX, we wish especially to acknowledge the contributions of A. V. Aho, S. R. Bourne, L. L. Cherry, G.
L. Chesson, S. I. Feldman, C. B. Haley, R. C. Haight, S. C. Johnson, M. E. Lesk, T. L. Lyon, L. E.
McMahon, R. Morris, R. Muha, D. A. Nowitz, L. Wehr, and P. J. Weinberger. We appreciate also the
effective advice and criticism of T. A. Dolotta, A. G. Fraser, J. F. Maranzano, and J. R. Mashey; and we
remember the important work of the late Joseph F. Ossanna
