Samuel J Leffler is a computer scientist, known for his work on BSD, from the 1980s to FreeBSD in the present day.
He created HylaFAX, LibTIFF, and the FreeBSD Wireless Device Drivers.
While working for the Computer Systems Research Group (CSRG, UC Berkeley) at University of California, Berkeley, Leffler helped with 4.1 and 4.2 BSD release.
After leaving Computer Systems Research Group, Leffler also worked at Lucasfilm, Pixar Animation Studios, Silicon Graphics, Alias Research, Softimage 3D, Cinetron Computer Systems and VMware.
Later, Leffler became an independent system design consultant.