Some additional context: the editor of the manual was Sam Leffler, who was a coworker of Lasseter at Lucasfilm at the time.
> The later, more popular versions of the BSD Daemon were drawn by animation director John Lasseter beginning with an early greyscale drawing on the cover of the Unix System Manager's Manual published in 1984 by USENIX for 4.2BSD.[7] Its author/editor Sam Leffler (who had been a technical staff member at CSRG) and Lasseter were both employees of Lucasfilm at the time. About four years after this Lasseter drew his widely known take on the BSD Daemon for the cover of McKusick's co-authored 1988 book, The Design and Implementation of the 4.3BSD Operating System.[8] Lasseter drew a somewhat lesser-known running BSD Daemon for the 4.4BSD version of the book in 1994.